工程上常用()来表示金属材料的强度。
A、抗压强度;
B、抗拉强度;
C、抗剪强度;
D、抗弯强度。
参考答案:B
My father is very busy. He has things to do. [ ]
A. so many
B. so much
C. such many
支配腘绳肌的神经是()
A.胫神经
B.腓总神经
C.胫神经与腓神经
D.股神经
E.闭孔神经