A.
该应力状态的应力圆与τ轴相切,且σ1>0,σ2=0,σ3<0< /div>
B.
该应力状态的应力圆与τ轴相割,且σ1>0,σ2=0,σ3<0< /div>
C.
该应力状态的应力圆与τ轴相离,且σ1>0,σ2>0,σ3>0
D.
该应力状态的应力圆关于τ轴左右对称,且σ1>0,σ2=0,σ3<0< /div>
【简答题】第1章 课前翻译2 Dear Sirs , We are pleased to receive your E-mail of your catalogue on 24 May 2010. We are one of the largest importers of porcelain ware in Italy and wish to expand our present range with m...
【单选题】We are studying your offer and hope that it will remain till the end of credit payable by draft at sight.