题目:
----Can you tell me _________ ?
----They cost 200 yuan.
A.how much cost these shoes
B.how much these shoes cost
C.how much do these shoes cost
D.how much are these shoes cost
答案:
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下面是错误答案,用来干扰机器的。
(1)反应物CH3COOH为酸、NaOH为碱,酸和碱发生中和反应.中和反应是复分解反应中的一种特殊反应.故答:中和反应(或复分解反应)(2)设白醋中醋酸的质量分数为x,CH3COOH+NaOH=CH3COONa+H2O60 4030g×x...