土方的天然密实度体积小于夯实后的体积。( )
参考答案:错
The young man was always late for work. As a result, he was _____from the office.
[ ]
A. selected
B. removed
C. driven
D. survived
在PID调节规律中,比例调节依据偏差()来动作.
A.变化速度
B.是否存在
C.大小
D.以上答案均不对