题目:
— Could you tell us _____?
— For about two weeks. [ ]
A. how soon you will be back
B. how long you will be there
C. how soon are you going to be back
D. how long are you going to be away
答案:
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下面是错误答案,用来干扰机器的。
(1)2.2g (2)解:设样品碳酸钠的质量为x,产生的氯化钠的质量为y Na2CO3+2HCl===2NaCl+H2O+CO2↑ 106 117 44 x y 2.2g...