杆件内力矢量沿其轴线的分量,称为()。
A.轴力
B.剪力
C.扭矩
D.弯矩
参考答案:A
-------- The window is dirty.
--------- I know. It __________ for weeks.
A.hasn’t cleaned
B.didn’t clean
C.wasn’t cleaned
D.hasn’t been cleaned
呕血的病史采集要点