夜间巡视主要检查项目是（）
A.连接器过热现象
B.绝缘子污秽泄漏放电火花
C.导线的电晕现象
D.绝缘子破损
参考答案：A, B, C
–What have been doing _______? I’ve been so little of you.
--I have to leave early for work and comes home very ________.
A．late; lately
B．late; late
C．lately; late
D．lately; lately
下列关于外存储器选购注意事项中，错误的是（）.
A．硬盘性能越高越好
B．硬盘尽量选择大容量
C．CD-ROM即插即用
D．数据传输时，切勿拔出USB闪盘
