(单选题)12: 一圆型截面梁，直径d=40mm，其弯曲截面系数WZ为（）。
A: 1000πmm3
B: 2000πmm3
C: 400πmm2
D: 400πmm3
1.(单选题)—Pleasegivemeahandtoprintoutthereport,won'tyou —________________ A.Y...
1.(单选题)—Hello,thisisJohnspeaking.CouldIspeaktoMike — A.Of course you can. B...
1.(单选题)—Iwouldliketomakeanappointmentforthemeeting.Whichdaywouldyouprefer,Tu...
1.(单选题)—Hey,Derek,whichdoyouthinkishardertolearn,marketingordesigning — A.I...
1.(单选题)—It'srathercoldinhere.DoyoumindifIclosethewindow —________________ A...
要做作业扫码我