CKU单元是ZXG10—BTS中的重要设备之一，其面板指示灯从上到下依

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问题单项选择题

CKU单元是ZXG10—BTS中的重要设备之一，其面板指示灯从上到下依次是（）。

A.告警指示灯，主备指示灯，运行指示灯，锁相指示灯

B.告警指示灯，锁相指示灯，，运行指示灯，主备指示灯

C.运行指示灯，主备指示灯，锁相指示灯，告警指示灯

D.告警指示灯，运行指示灯，主备指示灯，，锁相指示灯

答案

参考答案：D

选择题

-Ten minutes ago, there __________ an eraser, a pen and some books on the desk.But now there __________ anything on it.

-Don't worry. Maybe someone put them away.

A. was, isn't

B. were, isn't

C. is, wasn't

D was, wasn't

单项选择题

馈线从馈线窗下方进入机房：室外地排安装于馈线窗下方，水平走线架下的机房墙面上，避免馈线（）现象

A、交叉

B、第三点接地上翻

C、第三点接地下翻