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问题
单项选择题
实木地板同一板内含水率最大值与最小值之差不得超过（）。
A、4.0
B、5.0
C、3.0
D、6.0
答案
参考答案：
A
选择题
The teachers _______ the office for a few minutes when we arrived. We didn't meet them.
A. had been away from
B. had left
C. have been away from
D. have left
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判断题
交流发电机的容量越大，频率越高；容量越小，频率越低。（）
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