试题与答案

在X线管中用于发射电子的是() A.灯丝 B.集射罩 C.灯丝变压器 D.空间电荷补

题型:单项选择题 B型题

题目:

在X线管中用于发射电子的是()

A.灯丝

B.集射罩

C.灯丝变压器

D.空间电荷补偿变压器

E.电容电流补偿变压器

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:[评析] static声明的外部变量只限于被本文件引用,而不能被其他文件引用。用static来声明一个变量的作用有:①对局部变量用static声明,则为该变量分配的空间在整个程序执行期间始终存在:②全...

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