题目:
English is a language shared by several diverse cultures, _________ uses it differently.
A.all of which
B.each of which
C.all of them
D.each of them
答案:
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答案:C题目分析:在蒸发过程中,溶质是不变的。设蒸发前溶液的质量是m,则m×0.14=(m-100)×0.28,解得m=200g,所以溶质的质量是200g×0.14=28g,氢氧化钾的物质的量是28g÷56g/mol=0.5mol,则氢氧化钾的...