测量轴承震动常用的是速度传感器或（）。
A.加速度传感器
B.频谱仪
C.计数器
D.自准直仪
参考答案：A
An order came from the command ________ all the PLA men should rush to the disasterhit area
to help the people there. [ ]
A. how
B. that
C. which
D. where
论述对社会保障基金监管的必要性。
