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问题 单项选择题

有关ARPA的目标录取，下列哪些说法是正确的（）

A、目标录取是指对需要跟踪目标的选择及其跟踪的开始

B、一旦录取的操作完毕，该目标立刻即被稳定跟踪

C、目标录取还包括目标属性、尺度数据的录取，并送入计算机

D、自动录取时仅录取那些与避让有关的目标

答案

参考答案：A

句型转换

句型转换，每空一词。

1. They can hardly do the things they like. (改为反意疑问句)

    They can hardly do the things they like ______ ______?

2. I have been collecting stamps for many years. (对画线部分提问)

    ______ ______ you been collecting stamps?

3. We saw him go into a shop yesterday afternoon. (改为被动语态)

    He was ______ ______ go into a shop yesterday afternoon. (同义句改写)

4. If you don't study hard, you will fall behind others. (同义句改写) 

    ______ you study hard, you ______ catch up with others.

5. She became strong day by day as he took exercise. (同义句改写)

    The ______ exercise she took, the ______ she became.

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单项选择题

受弯构件正截面承载力计算中，不考虑受拉混凝土的作用是因为（）。

A、中和轴以下混凝土全部开裂

B、混凝土抗拉强度低

C、中和轴附近部分受拉混凝土范围小且产生力矩很小

D、中和轴以下混凝土不受拉力作用
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