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【判断题】
1 mol·kg -1 甘油水溶液和0.l mol·kg -1 甘油的乙醇溶液有相同的凝固点下降值。A.
正确
B.
错误
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B.
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A.
只是在各批产品之间分配间接费用的依据
B.
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C.
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【单选题】听力原文： The first postal service in North America began in New England in the 17th century. All mail arriving in Massachusetts colony was sent to the home of appointed official in Boston. In turn, the m...
A.
The history of Benjamin Franklin.
B.
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