您好,欢迎来到推发网 最新产品

上海杰尔德液压有限公司德国BOSCHREXROTH(博世-力士乐)液压元件泵阀直线导轨、直线轴承,滑块线轨。AVENTICS(安沃驰)气动元件,美国派克PARKER液压元件日本YUKEN(油研)液压元件VICKERS美国(威格士)液压元件

价    格

订货量

  • 面议

    不限个

陈女士销售经理
  • 手机已验证
  • 微信已验证
𐂒𐂓𐂒 𐂔𐂒𐂕𐂖 𐂗𐂘𐂒𐂖
  • 发货地上海 青浦区
  • 发货期限1天内发货
  • 供货总量78个
产品推荐
类型:比例阀材质:铸铁型号:R901231067
品牌:Rexroth/力士乐类型(通道位置):先导式连接形式:快装
驱动方式:电磁加工定制:否适用范围:R901231067
产品别名:R901231067适用介质:油品适用温度:R901231067℃
公称压力:R901231067MPa公称通径:R901231067mm安装形式:R901231067
工作温度:常温零部件及配件:配件流动方向:单向
形态:蝶式压力环境:常压主体材料:铸铁
R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH

R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH

R407031987--CYM1MP5/50/28/30A21/B11LKUVS38611
R407031988--CYM1MP5/50/28/180A21/B11LKUVS38613
R407031989--CYM1MP5/63/36/170A21/B11LKUVS38614
R407031990--CYM1MP5/160/90/401A21/B11LKUVS38615
R407031991--CYM1MP5/160/90/350A21/B11LKUVS38616
R407031994--CYL1M00/25/14/270C10/B1CHUXS38650
R407031997--CYM1MP5/63/36/120A20/B11HGDMS38653
R407032017--CYM1M00/80/56/1200A20/B11CGUMS38669
R407032022--CYL1MF3/32/18/1000C10/B1XHUMS38671
R407032024--CYM1MF1/63/45/130A20/B11HHDMS38672
R407032025--CYM1MP5/63/45/400A20/B11CFUMS38673
R407032035--CYL1MF3/40/22/50D10/B1CXUMS38677
R407032041--PISTON ROD         CGT3 63/28 CEU S7241
R407032042--PISTON ROD         F CGT3/63/28 S7241
R407032062--CYL1M00/40/22/45D10/B1CXUMS38691
R407032063--CYL1M00/40/22/15D10/B1CXUMS38692
R407032064--CYL1MT4/25/14/1600C10/B1CHUMS38693
R407032070--CYM1MT4/100/56/600A20/B11CGUMS38696
R407032078--CYM1MF3/100/56/125A20/B1XCGDMS38698
R407032079--CYM1MF3/125/70/125A20/B1XCGDMS38699
R407032083--CYM1M00/80/45/60A20/B1XCGDMS38702
R407032084--CYM1M00/80/45/100A20/B1XCGDMS38703
R407032095--CYM1MP5/160/110/1500A20/B11LKDMS38697
R407032103--CYM1MT4/160/110/3700A21/X11CHUMS38715
R407032104--CYL1MP5/40/22/50D10/B2CKUVS38716
R407032107--CSM1MP5/50/36/600A21/P11CFUTTD
R407032109--CYL1MP5/80/45/1010D10/B1XFUVS38719
R407032112--CYM1MP5/63/36/200A20/S11CKUTS38721
R407032117--TEMPOS. GH-M-0580M-RR4-1-A0, 4 - 20 MA
R407032119--TEMPOS. GH-M-0230M-RR4-1-A0, 4 - 20 MA
R407032120--CYM1MP5/80/56/520A20/B11CGUMS38724
R407032132--TEMPOSONIC RH-M-2900M-RR4-1-A01
R407032137--TEMPOS. GH-M-0880M-RR4-1-A0, 4 - 20 MA
R407032140--TEMPOSONICS GH-M-0480M-RR4-1-A0,4-20 MA
R407032144--TEMPOS. GH-M-0100M-RR4-1-A0, 4 - 20 MA
R407032157--CYL1MP5/40/22/125D10/B1CHUMS38730
R407032165--CYM1MP5/25/18/450A21/B11LHDVS38733
R407032167--CYM1MT4/50/36/1790A21/B11LFDVS38735
R407032175--METALLAVSTRYKARE WM0000630-N7MSI
R407032186--TEMPOSONIC GH-M-0600M-RR4-1-A0
R407032187--CYM1MP5/63/45/800A20/B11CKUXS38749
R407032198--CYM1M00/32/18/250A20/B11HGEMS38752
R407032199--CYM1M00/32/18/300A20/B11HGEMS38753
R407032200--CYM1M00/32/18/250A20/B11HGEMS38754
R407032206--SEAL KIT 269H-64-40 S38755
R407032208--SEAL KIT           CYM1.080/045X S38714
R407032209--CYM1MP5/25/14/100A20/B11CXUMS38757
R407032210--CGM1M00/100/70/945A21/B11CGDMS38758
R407032214--CYM1MF3/63/36/1450A21/B11CGUMS38762
R407032215--CYM1MF1/100/70/350A20/B22CXETS38763
R407032221--CYM1MF3/50/28/160A21/B11CGUMS38767
R407032225--CYM1MP5/80/45/1000A21/B11LGDMS38769
R407032226--CYM1MP5/100/56/1000A21/B11LGDMS38770
R407032228--PISTON ROD KIT CGM1/70/945A10/CGDMS38771
R407032230--CDT3MT4/63/45/100Z10/B1CDUMS7243





R407032233--CYM1MF1/40/22/200A20/B11HGUMS38774
R407032234--CYM1MF1/50/36/900A20/B11HHUMS38775
R407032235--CYL1MP5/40/22/250D10/B1CFUMS38776
R407032248--CYL1MP5/63/36/135D10/BXCFUMS38777
R407032251--PISTON ROD 208/50/36/215 S38779
R407032255--CYM1MP5/80/45/2600A20/B11CGSMS38781
R407032269--CYM1MT4/40/28/1300A20/B44CHDMS38792
R407032270--CYM1MP5/32/18/50A20/B11CGDMS38793
R407032272--CYM1MT4/63/45/250A20/BXXCFDMS38795
R407032273--CYM1MT4/40/28/250A20/BXXCFDMS38796
R407032274--BIGMEC 228/MP6/50/36/250/DV01CL S38797
R407032279--CXM1MP5/63/36/160A21/B11CGDMS38799
R407032295--CYM1MP5/40/28/80A21/B22CXDMS38806
R407032297--KOLV S38303 KOMPLETT
R407032300--CYM1MT4/80/56/150A20/B11CHUMS38808
R407032301--CYM1MT4/40/22/120A20/B11CGUMS38809
R407032311--CDT3ME5/40/28/300Z10/B1CHUTS7245
R407032315--SEAL KIT S5629
R407032327--CYM1MT4/100/70/2600A20/B11CGUVS38817
R407032328--CYM1MT4/100/70/2900A20/B11CGUVS38818
R407032329--CYM1MT4/125/90/3200A20/B11CGUVS38819
R407032331--CYM1MT4/80/56/3200A20/B11CHUVS38820
R407032332--CYM1MP5/63/36/350A21/B11CHDMS38821
R407032337--CYM1MT4/100/56/450A21/X11CKUTS38822
R407032342--CYM1MT4/80/56/1100A21/B11CFDMS38827
R407032343--CDT3MS2/63/45/100Z10/B1CFUMS7246
R407032344--PISTON ROD         CDT3/63/45 S7246
R407032348--CYM1MF3/80/45/120A20/B11CXXTS38830
R407032349--250H/M35/39/20/80/FS-BS S38831
R407032351--CYM1MP5/63/36/124A21/B11CGDMS38833
R407032360--CYM1MP5/40/28/110A20/B22CXDMS38838
R407032363--CYM1MP5/50/28/390D10/B1CHUMS38841
R407032368--SEAL KIT           268H/039/020 S30258 &
R407032373--KONTAKT STCO9131-7 + 13M K26
R407032375--CYM1MT4/50/28/12A20/B11CXUMS38847
R407032377--CYM1MP5/160/110/1960A20/F11LHUMS38849
R407032379--CYM1M00/25/14/475A20/B11CGEMS38851
R407032380--PISTON ROD         204/25/12/72 S38853
R407032386--CYM1MF3/80/56/2000A20/B11CGUMS38854
R407032387--BIGMEC 228/MP6/50/36/215/XM01CL S38845
R407032390--CYM1MT4/80/56/150A20/B11CFUMS38855
R407032391--CYM1MT4/40/22/120A20/B11CKUMS38856
R407032393--CSM1MP5/100/56/345A20/B11CGUMTC
R407032403--CYM1M00/50/36/255A20/X11CXUMS38862
R407032407--CYM1MT4/100/70/1800A20/B33LKEAS38865
R407032408--CYM1MF3/125/70/1700A20/B11LGDVS38866
R407032409--CYL1MP5/63/36/100D10/B1CFUMS38863
R407032410--CYL1MP5/63/36/200D10/B1CFUMS38864
R407032413--CYM1MFX/80/56/600A21/B11CEDMS38869
R407032431--CYM1MP5/125/90/2400A20/F11CKUMS38872
R407032432--HANKSTG 251H/268H-100-65-1550-F2 S38873
R407032436--SEAL KIT           CGM1.063/036M S38710
R407032445--CYM1MT4/160/90/780A20/B11CGDXS38878
R407032465--CSM1MP5/80/45/550A20/P11CKETTD
R407032466--CYM1MT4/32/22/200A20/B22CKDVS38880
R407032492--CYL1MFX/40/22/180D10/BXCKUMS38884
R407032496--CYM1MF3/100/70/3200A20/S11CGUSS38887
R407032500--BIGMEC/228/M00/160/110/200/UM01CX S38889
R407032507--CSM1MF1/63/36/100A20/B11CGUMTF
R407032523--CDT3MT4/63/45/2120Z10/B1CFDMS7248
R407032526--CYL1MF4/63/36/20D10/B1CHUMS38895
R407032527--CYL1MP5/80/45/100D10/B1CFUMS38896
R407032528--CYL1MT4/40/28/1130A20/B11CKUMS38897

R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH

R407032531--PISTON ROD KIT 226/63/36/257/CGDT S38899
R407032534--CSM1MT4/50/36/610A20/B11CGUMTC
R407032535--CDT3MT4/40/28/50Z10/B1CHUMS7249
R407032544--CYM1MF3/25/14/50A20/B11LGUMS38903
R407032546--CYM1MT4/125/90/4260A20/B11CFDVS38905
R407032547--CYM1MP5/63/36/520A20/B11CGUMS38902
R407032551--268H/M29/100/50/550/FS-B2 S38906
R407032558--CYL1MXX/50/28/55D10/X1CXUXS38904
R407032559--CYM1MFX/63/36/30A20/X11XXDTS38908
R407032561--CYM1M00/32/22/20A20/B11CGDMS38910
R407032563--CYM1MP5/80/45/165A20/B11CKDMS38911
R407032568--CYM1MP5/40/28/160A20/B11CGUMS38913
R407032569--OMBYGGN. TILL - R407031436
R407032570--OMBYGGN. TILL - R407031435
R407032572--SEAL KIT           CYT3.040/028X S6762
R407032576--CYL1MP5/100/56/400D10/B1CFUMS38920
R407032586--CYM1MP5/50/36/200A21/B11CXEVS38925
R407032590--CYM1MF1/80/56/1500A20/B11CGDVS38923
R407032592--LEDLAGER GEEW 20 ES-C2 S38926
R407032593--CYM1MF1/63/45/90A20/B11CXDMS38927
R407032594--CYM1MF1/63/45/90A20/B22CXDMS38928
R407032598--CYM1MP5/125/90/250A20/B11CFDMS38931
R407032599--CYM1MP5/40/28/850A20/B11LKUTS38932
R407032601--PISTON ROD A28434
R407032604--PISTON ROD 150H/150/90/945 S38934
R407032609--CYM1MT4/25/18/1000A20/B11CGDMS38935
R407032637--CDT3MXX/63/45/125+200Z10/B1HFUMS7251
R407032638--CYM1MP3/63/36/100A20/B11CGUVS38940
R407032643--CYM1MT4/63/36/750A21/B11CGSMS38941
R407032644--CDT3ME5/63/28/600Z10/BXCHUMS7252
R407032645--CDT3MT4/63/28/1100Z10/B2CHUMS7253
R407032651--CYM1MS2/125/70/1600A20/B11CGEVS38945
R407032662--F?STE CGKD-3X S38946
R407032690--CYL1MP5/40/22/10D10/BXCXUMS38949
R407032695--CYM1MT4/100/70/1900A20/B11LKDAS38954
R407032698--CYM1MF3/125/70/1600A20/B11LKUAS38955
R407032701--CYM1MF1/63/45/1100A20/B22CXUMS38960
R407032702--CYM1MF1/50/36/100A20/B22CGUMS38961
R407032703--MTS ART. 253141 WITH 3M K59 CABLE
R407032704--CYLINDER TUBE CYM1/MT4/140/2500 S38963
R407032712--CYM1MT4/160/90/1010A20/B11LKUMS38950
R407032715--PISTON ROD 268H/50/25/1700-F1-B1 S38968
R407032719--KIT CSM1MT4/63/45/900A20/B11CFUSS38970
R407032720--KIT CSM1MT4/63/45/435A20/B11CFUSS38971
R407032721--KIT CSM1MT4/63/45/1203A20/B11CFUSS38972

R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH

R407032722--KIT CSM1MT4/50/36/295A20/B11CFUSS38973
R407032723--KIT CSM1MT4/80/45/940A20/B11CKUSS38974
R407032724--KIT CSM1MT4/50/36/300A20/B11CFUSS38975
R407032725--KIT CSM1MF1/63/45/730A20/B11CGUSS38976
R407032726--KIT CSM1MT4/80/45/820A20/B11CGUSS38977
R407032727--KIT CSM1MF1/63/45/450A20/B11CGUSS38978
R407032728--KIT CSM1MT4/63/45/1050A20/B11CFUSS38979
R407032729--KIT CDM1MP5/63/45/110A20/B11CFUSS38980
R407032730--CYM1MT4/80/56/720A20/B33CKEAS38982
R407032736--BIGMEC/MT4/100/70/3200+400/DM56CLS38987
R407032739--CYM1MP5/50/28/130A20/B11LKUMS38988
R407032744--CYM1MP5/50/28/280A20/B11LKUMS38989
R407032745--CSM1MP5/40/28/200A21/B11CKUMTC
R407032747--CYL1MF3/100/56/3300/D10/B1CHUMS38993
R407032769--CDT3MP5/80/36/1000Z10/B1XFDMS7257
R407032774--CDT3MS2/25/18/55Z10/B2HDUMS7258
R407032777--PISTON ROD 226/125/70/520 S38998
R407032796--CYM1M00/40/22/60A20/B11CGETS39002
R407032798--CYM1MP5/50/36/600A20/B11LFDMS39003
R407032799--CYM1MP5/40/22/350A20/P11CKUTS39005
R407032806--CYM1MT4/100/56/305A20/F11CGDMS39007
R407032808--CYM1MT4/140/100/2100A10/B2CFDMFVS39004
R407032811--CYL1MP5/100/56/1500D10/BXCFUMS39009
R407032816--CDT3ME5/160/110/450Z10/X1CXUTS7262
R407032818--CYM1MT4/80/56/1450A21/B11CGDMS39012
R407032819--SEAL KIT           CDL1/125/070 S39013
R407032822--SEAL KIT           CDL1/050/028 S39016
R407032827--CYL1MP5/125/70/300D10/B1CFUMS39020
R407032829--SEAL KIT           204/125/090 S39022
R407032835--CYM1MT4/40/28/100A20/B11CFUXS39025
R407032839--CYM1MP5/80/45/200A20/F11CKEVS39026
R407032841--DAMPING SLEEVE     CDM1/32/22 S39010
R407032842--CYM1MF3/100/70/300A20/B11CXUMS39027
R407032858--CYL1MP5/125/70/125D10/B1CFUXS39032
R407032861--CYL1MP5/63/36/400D10/B1CFUXS39035

R407031737--CGT3MS2/80/36/200Z10/B1CXUMS7234
R407031738--CDT3MX3/125/XX/400Z10/B1CXUMS7235
R407031739--KOLVST?NG  250H-450-140-2800 S38517
R407031740--SEAL KIT S29571
R407031741--CYM1M00/40/22/120A20/B11CGKMS38518
R407031749--CSM1MP5/63/45/750A20/B11CGUMTD
R407031752--CSM1MT4/50/36/220A20/B11CGUMTD
R407031753--CSM1MT4/100/56/150A20/B11CGUMTD
R407031768--KSTG 251H-76-40-150 A07813
R407031770--CDT3MP5/50/22/120Z10/B1HFUTS7237
R407031771--CYM1MF3/50/28/500A21/B11LKUMS38538
R407031775--CYM1MF3+MF4/40/28/1280A20/B11CGDMS38539
R407031776--TEMPOS. RH-M-0130M-D70-1-S2G1100, SSI 24
R407031779--CYL1MP5/40/22/50D10/B1CHUXS38540
R407031780--CYM1MP5/63/36/400A20/B11LKUTS38541
R407031790--BIGMEC228/MT4/50/36/193/DM01CL S38542
R407031808--CGM1MF1/100/56/200A20/B11CGUVS38544
R407031809--CYM1MT4/100/70/2880A20/B11CKDVS38545
R407031810--CYM1MT4/63/45/3100A20/B11CKDVS38546
R407031811--CSM1MT4/63/45/540A20/B11CKUSTC
R407031812--CSM1MT4/100/56/265A20/B11CKUSTC
R407031813--CYM1MS2/125/90/3500A20/B11CGDVS38549
R407031815--CYM1MS2/125/90/4750A20/B11CGUVS38551
R407031818--CYM1MT4/80/56/530A20/B11CXUMS38552
R407031820--CYM1MP5/80/56/400A20/B11CXUMS38553
R407031823--CYM1MT4/80/56/530A20/B11CXUVS38554
R407031824--CYM1MT4/160/110/2000A20/X44CXUMS38555
R407031834--CSM1MF3/100/56/80A20/B11CGUMTC
R407031846--CYM1MP5/63/36/120A20/B44CGDMS38568
R407031851--TEMPOS. GH-M-0080M-D60-1-A0, 4 - 20 MA
R407031856--250H/M17/50/25/140/F0-B0 S38574
R407031862--CYL1MF3/25/14/45C10/B1XHUXS38580
R407031863--CYL1MF3/25/14/125C10/B1XHUXS38581
R407031864--CYL1MP5/100/56/320D10/B1XFUMS38582
R407031866--PISTON ROD         CSM1A20/63/36 S38576
R407031867--CGT3ME5/160/70/70Z10/B2HHUMS7238
R407031868--CYM1MT4/100/56/120A21/B11CGDMS38585
R407031874--CYL1MP5/40/22/900D10/B1XHUMS38584
R407031896--CYL1MF3/50/28/900D10/B1XHUMS38593
R407031897--CYM1MF3/125/90/3500A21/B11CGDMS38594
R407031898--CYM1MF3/125/90/4000A21/B11CGDMS38595
R407031899--CYL1MP5/63/36/110D10/B1CHUMS38596
R407031900--CYM1MP5/50/28/227A20/B11CKUMS38597
R407031926--CYM1MP5/80/56/800A21/B33LFDXS38605
R407031930--PISTON ROD S21435
R407031932--CYM1MP5/40/22/80A20/B11CGDMS38608
R407031933--250H/M28/100/50/1300/FS-BS S38609
R407031938--CYL1MP5/63/36/110D10/B1CFUMS38610
R407031940--CYM1MT4/32/22/145A21/B11LHDMS38612
R407031945--SEAL KIT           CYM.050/028T S34634
R407031946--BIGMEC 228/MF3/125/90/150/UX01CX S38617
R407031949--CYM1MT4/160/90/3900A21/B11CGUMS38621
R407031950--CYM1MP5/50/36/50A20/B11CGUMS38622
R407031956--BIGMEC 228/MP6/80/56/300/DM01CLS38628
R407031960--CYL1M00/25/14/270C10/B1CHUXS38619
R407031961--CYM1MF3/40/22/60A20/B11CGEMS38632
R407031962--CYM1MF3/63/36/60A20/B11CGEMS38633

R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH

R407031963--CYM1MF3/80/45/80A20/B11CGEMS38634
R407031964--CYM1MF3/100/56/80A20/B11CGEMS38635
R407031965--CYM1MF3/125/70/80A20/B11CGEMS38636
R407031966--CYM1MF3/160/90/80A20/B11CGEMS38637
R407031969--CYM1MT4/50/28/300A21/B11CGDMS38640
R407031970--CDT3MP5/100/45/525Z10/B1CXDMS7239
R407031971--274H/M28/39/20/65/FS-BS S38642
R407031972--CYM1MP5/40/22/30A20/B22CGDMS38643
R407031973--CYM1MT4/32/22/50A20/B22CGDMS38644
R407031984--CYL1MP5/50/28/120D10/B1CFUMS38647
R407031985--SEAL KIT           CYL.025/014M S38598
R407032862--CYL1MP5/63/36/300D10/B1CFUXS39036
R407032863--CYL1MF3/50/28/150D10/B1CHUXS39037
R407032864--CYL1MP5/40/22/225D10/B1CFUXS39038
R407032865--PISTON ROD KIT 226-63-36-380-CGD? S39039
R407032866--CDT3MP5/100/70/975Z10/B1CHDXS7263
R407032867--CDT3MP5/125/90/1122Z10/B1CHDXS7264
R407032868--SEAL KIT           CDT3.100/070X S7263
R407032869--SEAL KIT           CDT3.125/090X S7264
R407032870--CYM1MF3/40/28/500A20/B11CGUMS39040
R407032874--CYM1MP5/160/90/215A20/B11CXUMS39041
R407032882--CYL1MF3/32/18/200C10/B1CHUMS39044
R407032883--CYL1MF3/32/18/50C10/B1CHUMS39045
R407032904--CDT3MEX/25/12/150Z10/B1CXDMS7265

供应商信息
公司图片
上海杰尔德液压有限公司 进入首页

上海杰尔德液压有限公司 销售波压设备、机床附件、机电设备、金属材料、油泵阀门、五金交电、塑胶制品、工控仪器仪表及零部件,[依法须经批准的项目 , 经相关部]批准后方可开展经营活动]

点击查看>
企业类型 有限责任公司(自然人投资或控股) 注册资本 100.00万人民币
公司注册地址 上海市青浦工业园区友爱路18号2幢K区109室 统一社会信用代码 91310118MA1JN4248B
登记机关 青浦区市场监督管理局 法定代表人 段彩霞
公司成立日期 2019-06-04 营业期限 2019-06-04 至 2029-06-03
经营范围 销售液压设备、机床附件、机电设备、金属材料、油泵阀门、五金交电、塑胶制品、工控仪器仪表及零部件,从事货物及技术的进出口业务。 【依法须经批准的项目,经相关部门批准后方可开展经营活动】
联系方式
联系人
陈女士微信
𐂒𐂓𐂒 𐂔𐂒𐂕𐂖 𐂗𐂘𐂒𐂖
上海杰尔德液压有限公司
  • 地       址 上海 上海 青浦区 上海市青浦工业园区友爱路18号2幢K区
  • 免责声明 :

    本页面所展现的R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH信息及其他相关推荐信息,均来源于其对应的商铺,信息的真实性、准确性和合法性由该信息的来源商铺所属企业完全负责。推发网对此不承担任何保证责任。

  • 友情提醒 :

    建议您在购买相关产品前务必确认供应商资质及产品质量,过低的价格有可能是虚假信息,请谨慎对待,谨防欺诈行为。

上海杰尔德液压有限公司
  • 身份验证
    • 营业执照已上传
    • 手机已验证
    • 微信已验证
  • 经营模式
    经销批发
  • 注册资本
    100.00万人民币
  • 企业类型
    有限责任公司(自然人投资或控股)
  • 主营产品
  • 公司地址
    上海 上海 青浦区 上海市青浦工业园区友爱路18号2幢K区
在线留言
本页信息为上海杰尔德液压有限公司为您提供的"R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH"产品信息,如您想了解更多关于"R901231067 3DREME16P-7X/200YG24K31A1V电磁减压阀REXROTH"价格、型号、厂家请联系厂家,或给厂家留言。 进入店铺 在线留言