改变电动机运行状态时，要用（）确认电动机不带电，方能进行操作。
A.试电笔
B.螺丝刀
C.活动扳手
D.手钳
参考答案：A
It’s high time we _______ effective _______to improve your working conditions.
A．take; means
B．made; measures
C．took; measures
D．do; actions
环境影响评价工程师职业资格登记类别共有______个。
A．2 B．11 C．13 D．16
