问题
单项选择题
X线产生过程中，电子高速运动所需能量主要取决于()
A．靶物质原子序数
B．管电流
C．管电压
D．旋转阳极转速
E．灯丝焦点大小
答案
参考答案：C
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X线产生过程中，电子高速运动所需能量主要取决于()
A．靶物质原子序数
B．管电流
C．管电压
D．旋转阳极转速
E．灯丝焦点大小
参考答案：C
阅读下面短文，然后根据短文内容用方框中所给的词适当形式填空（有两个多余的）。
(生活方式). He goes to bed early (早) and gets up early every day. He likes doing __3__. Every morning, he runs one hour __4__ breakfast. He likes eating __5__ food. He eats lots of vegetables and fruits every day. He never (从不) __6__ he is old. He even (甚至) starts to learn to play computer games. He likes learning __7__ things. My grandfather __8__ likes watching funny movies. __9__ favorite movies are __10__. |