高压验电笔
参考答案：
用来检查高压网络变配电设备、架空线、电缆是否带电的工具。
Professor Zhang gave all the textbooks to all the pupils, except ________ who had already taken them.
A．these
B．ones
C．the ones
D．the others
人民警察纪律与义务都是人民警察在履行职责时必须遵守的。( )
