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问题 单项选择题

在管电压和管电流相同时，与连续X线强度有关的是

A．靶面的倾角
B．球管内真空度
C．靶物质的原子序数
D．靶物质的厚度
E．靶物质的颜色

答案

参考答案：C

解析：在管电压和管电流相同时，与连续X线强度有关的是靶物质的原子序数。

改错题

College students have a little ways to pay their college fees. Many students have their parents to pay the fees. Some students may apply to a bank loan and others will try to find part-time jobs in and out of the campus. Apart from this, many good student can win a scholarship. By this way they can pay at least part of the fees. As to me, I will let my parents pay half of their fees because they are rich enough. Beside my study, I will take up a part-time job by teach some high school students math, physics, chemistry and English, as I’m very good at these important subjects. Of course I will also work very hard at my lessons in order to I can easily win a scholarship.
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单项选择题

根据《国家政府系统办公自动化建设2001—2005年规划纲要》，全国政府系统要用3～5年的时间，初步建立起以（）为基本架构的我国政府系统信息化框架。

A.“三网一库”

B.“四网一库”

C.“三网”

D.“四网二库”
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