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问题 问答题 简答题

什么是地震波振幅的吸收衰减？

答案

参考答案：

实际地层并不是完全弹性介质这样波在实际介质中传播时，其能量衰减要比在完全弹性介质中的衰减要快，这种衰减叫做介质对波的吸收衰减.

单项选择题

下列哪项不是测定细胞因子的生物学方法()

A．促进细胞增殖和抑制细胞增殖法

B．抗病毒活性法

C．ELISA法

D．趋化作用测定法

E．MTT法
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句型转换

句型转换。

1. The doctor asked the old man to stop smoking. (改为一般疑问句)

    ________ the doctor ________  the old man to stop smoking?

2. The girl is clever. She can work out difficult problems. (合并为一句)

    It is clever ________  the girl ________ work out difficult problems.

3. I prefer doing everything for myself to asking my mother for help. (保持句意基本不变)

    I would ________  do everything for myself ________  ask my mother for help.

4. Those local businesses supported the charity show. (改为被动语态)

    The charity show ________  ________  by those local businesses.

5. Martin was so excited at the news that he couldn't fall asleep. (改为简单句)

    Martin was ________  excited at the news ________  fall asleep.

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