带电作业时，直接接触单相回路的零线没有危险。
参考答案：错
Being physically examined for free twice a year is what every clerk _____ be ensured in any company
of the state. [ ]
A. must
B. ought to
C. shall
D. need
EXC9000励磁系统通道手动切换逻辑是什么？
