题型:名词解释 Mary came ______ in the Chinese exam. This is ______ time she got the good mark. [ ]A. first, second B. the first, the second C. first, the second D. the first, second 查看答案
题型:名词解释 力偶矩m1=7N·m与m2=5N·m分别作用在如图5-3-12所示圆轴的B、C截而处,已知圆轴长l=50cm,直径d=10mm,材料的剪切弹性模量G=82GPa,则A、C两截面的相对扭转角为()。A.φCA=-1.42°B.φCA=-1.07°C.φCA=0.19°D.φCA=2.49° 查看答案