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【单选题】
听力原文：W: Is this a good reference book? M: It's good. But I wouldn't buy it because it's too expensive. Q: What does the man think about the reference book? (4)A.
He would buy it, though expensive.
B.
It's good, but it costs too much.
C.
It's good and cheap.
D.
It is not worth buying.
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反馈参考答案：
举一反三
【单选题】测量额定电压在500v以下的设备或线路电阻时,可选用()绝缘电阻表
A.
200v火500v
B.
500v或1000v
C.
1000v或1500v
D.
以上都不正确
【简答题】xoy面上,切应力作用方向是()。
参考解析：
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