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多项选择题
吸收操作的逆过程为脱吸,常用的脱吸方法有______。
A、升温;
B、降温;
C、减压;
D、吹气
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The following diagram is about an investigation of the school performance of immigrant children based PISA scores (Program for International Student Assessment) (Source: The Economists Dec. 10,2016). Read it and decide whether the following description of it is true or not.
The immigrant children performed better than the non-immigrants children in Macau, Canada, Australia and Singapore.
A、正确
B、错误
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D.生活必需品
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A.按规定数额交纳租调
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C.田赋、徭役、杂税合并纳税
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