物流过程的增值功能往往通过流通加工得到很大的体现,对整个物流系统完善起到重大作用。()
参考答案:对
—Look! Here is a message on my mobile phone, asking me to send money to....
—Don’t believe it! It’s a trick. More than one person _____ by such tricks so far.
A.had been cheated
B.was cheated
C.have been cheated
D.has been cheated
承受横向荷载或旋转力矩的紧螺栓连接,该连接中的螺栓( )。
A.受剪切作用B.受拉伸作用C.受剪切和拉伸的共同作用D.既可能受拉伸作用也可能受剪切作用