当发现雷达天线无法稳定在水平面中时，则可以断定（）。A.天线组

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问题单项选择题

当发现雷达天线无法稳定在水平面中时，则可以断定（）。

A.天线组有故障

B.天线组，收发组之一或两者均有故障

C.故障可能出现在天线组、收发组、控制盒或显示器中

D.故障可能发生在天线组、收发组、控制盒或组件的接口电路中

答案

参考答案：D

选择题

下列计算中，不正确的是（　　）

A．（a²）³=a⁶

B．a²+a²=2a²

C．a⁶÷a²=a⁴

D．a⁵•a⁵=a²⁵

填空题

单词拼写。

根据下列各句句意和空白之后的汉语提示词，在横线上写出对应单词的正确形式，每空只写一词。

1. We all hope those who are_______(遭受) from this disaster will be safe.

2. I am glad to accept your kind ________(邀请).

3. We should have a positive ________(态度) towards life.

4. We congratulated him ________(真诚地) on his success.

5. Price and _______(质量) are the two chief considerations for most of consumers.

6. The civilization of _______(古老的) Greece is famous in the world.

7. He is quite ________(熟悉) with this country because he has been here for ten years.

8. I burst into _______(笑声) when my brother walked in wearing his funny clothes.

9. The plane caused a ________(革命) in our way of traveling.

10. The only step between dream and _______(现实) is action!