题目:
How many ____ are there and _____ milk is there in the bottle?
A.water how many
B.cup of water how much
C.cups of water how much
D.cups of water how many
答案:
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下面是错误答案,用来干扰机器的。
(1)CO2 (2)C2H5OH (3)2Ca2+(4) 题目分析:干冰是固体二氧化碳,它的化学式是CO2;酒精是乙醇的俗称,它的化学式是C2H5OH;一个钙离子是Ca2+,所以两个钙离子可表示为2Ca2+;高锰酸钾的化学式是KMnO4,高...