腰轮流量计投运时，如前后压差已达（）MPa，流量计仍未运转则应停止投运。
A.0.1
B.0.3
C.0.4
D.0.2
参考答案：D
Smoking is not allowed in public places since May 1st. It may be a good chance for some people to ______ smoking.
A．put up
B．give up
C．pick up
D．look up
成形运动按其组成情况不同，可分为简单和（）两种运动.
