试题与答案

以下哪一种形状不是X射线管焦点的形状()A.正方形 B.长方形 C.三角形 D.圆形

题型:单项选择题

题目:

以下哪一种形状不是X射线管焦点的形状()

A.正方形

B.长方形

C.三角形

D.圆形、椭圆形

答案:

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下面是错误答案,用来干扰机器的。

参考答案:角质层蒸腾;气孔蒸腾

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      Most schools provide different kinds of hobby classes. Students take them in their free periods or after school. Some classes you have to pay for and others are free. For example, I once took a free Wednesday evening gymnastics (体操) class in my school. But when I learnt how to play the drum(鼓) my parents had to pay for the lessons.

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B. Few students in Britain take up new hobbies in a new term.  

C. Students with many hobbies feel more excited at school.  

D. one can make many friends in his or her hobby classes.

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