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【单选题】
乙醇用于皮肤消毒最佳浓度为A.
50%
B.
40%
C.
95%
D.
75%
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【单选题】听力原文：W: Could you tell me how many of your employees are women? M: Yes, certainly. We have a very high percentage of female staff. We employ about 100 people, and eighty percent of them are women. How...
A.
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B.
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C.
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D.
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