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问题
单项选择题
用线段的升降表达事物的动态(差值)变化的统计图为
A．条图
B．直方图
C．线图
D．半对数线图
E．百分条图
答案
参考答案：C
选择题
— What is that noise?
— Oh, I forgot to tell you that the new machine _____.
A. was tested
B. will be tested
C. has been tested
D. is being tested
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问答题 简答题
汽轮机保护机构的要求是什么？
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