题目:
18. When Tom woke up, he found himself_______in bed, with his bag beside him.
A.lying; laid
B.lying; lay
C.lie; lying
D.lied; lied
答案:
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答案:CVa>Vb时,醋酸过量,根据物料守恒可知,A正确。 Va=Vb时,二者恰好反应,溶液显碱性,根据质子守恒可知c(CH3COOH) +c(H+)=c(OH-),B正确。选项C中根据电荷守恒c(K+)+ c(H+) =c(OH-)+ c(CH3C...