关于X线管阳极的描述，错误的是（） A.选用高熔点的物质 B.保

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问题单项选择题 A1/A2型题

关于X线管阳极的描述，错误的是（）

A.选用高熔点的物质

B.保持较高的真空度

C.阻止高速电子流的运动

D.选用原子序数较高的物质

E.用来完成高压电路的回路

答案

参考答案：B

填空题

用rise, arise, raise和arouse的适当形式填空。

1. The speech made by Yu Dan__________ great attention.

2. New difficulty will _________ from such situation.

3. I was tired of the quarrel ___________between them.

4. After the earthquake many volunteers ___________money for people in great need.

5. My spirits__________ when I heard the good news.

6. I saw tears___________ from her eyes.

问答题简答题

简述消息主体的功能。