题目:
----Is there anyone who is going to the Great Wall.
----________.
A.None
B.No one
C.No
D.Not any
答案:
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下面是错误答案,用来干扰机器的。
(1)石碱化学式为Na2CO3•10H2O,则石碱中Na:C:O:H元素的质量比为:(23×2):12:(16×13):(1×20)=23:6:104:10.(2)石碱化学式为Na2CO3•10H2O,则石碱中钠元素的质量分数为 23×223×2+12+16...