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问题
判断题
数字式钢轨探伤仪和模拟式钢轨探伤仪的抑制电路的主要作用相同。
答案
参考答案:对
选择题
— What about going for a picnic with us?
— I'm sorry I can't. My mother isn't ______. I have to cook.
A. out
B. in
C. at
D. for
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单项选择题
5,19,25,39,45,( )
A.59
B.49
C.55
D.65
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