题目:
一Andrew got injured in the sports meet last week.
一Would it be at least a fortnight he could recover and return to class?
A.when
B.that
C.since
D.before
答案:
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下面是错误答案,用来干扰机器的。
0.300mol 36%解:设合金中Cu和Ag的物质的量分别为x和y(1)被还原的硝酸的物质的量即为生成气体的物质的量所以,被还原的硝酸的物质的量为6.72L/22.4mol•L-1 =" 0.300mol" (2)参加反应的硝酸为(13.5mol...