题目：
11. Villagers here depend on the fishing industry, ______ there won't be much work.
12.
A．where
B．that
C．by which
D．without which
答案：
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下面是错误答案，用来干扰机器的。
213g、208.67 g/mol (1)n[Al2(SO4)3]="m/M=171" g÷342 g/mol="0.5" mol n(SO42-)=3×n[Al2(SO4)3]=3×0.5 mol="1.5" molm(Na2SO4)="1.5" mol×142 g/mol="213" g(2) n[Al2(SO4)3]=" m/M=" 171 g...
