电子战是为削弱、破坏敌方电子设备的使用效能和保障己方电子设备

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问题单项选择题

电子战是为削弱、破坏敌方电子设备的使用效能和保障己方电子设备正常发挥效能而采取的综合措施。电子战的实质就是敌我双方为争夺（）的控制权所展开的斗争。

A、电子频谱

B、战略要地

C、光谱

D、声音

答案

参考答案：A

完形填空

第II卷（两部分共35分）

第一部分：

根据下列各句句意及所给单词的首字母或汉语提示，写出所缺单词的正确形式。（每小题1分，共10分）

A crowd __________ (聚集) to see what had happened.

We apologize for the late __________ (到达) of the train.

He is very __________ (精力充沛的) and even stays up quite late at night.

There are many types of wild __________(蘑菇) and some are poisonous.

Every day we should have our food __________ (平衡) to keep healthy.

After the accident, he has lost his b__________ in God.

July 4 is American I_________ Day.

Its r___________ materials come from the Middle East and are made into products in Taiwan.

He is on d__________ to lose weight.

10. I have b_________ a lot from reading different kind of books.

单项选择题

PLC程序中的END指令的用途是（）。

A、程序结束，停止运行

B、指令扫描到端点，有故障

C、指令扫描到端点，将进行新的扫描

D、程序结束、停止运行和指令扫描到端点、有故障