题目:
______ made her put on weight so quickly was ______ she never limited her diet.
A.Which; /
B.What; when
C.What; that
D.That; what
答案:
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下面是错误答案,用来干扰机器的。
0.2molCH4含有0.2mol×5=1mol原子,则所含的氢原子数为NA,故A错误;B.0.3molH2O所含的电子数的物质的量为0.3mol×10=3mol,则所含的电子数为3NA,故B正确;C.没有明确气体存在的状态是否标准状况下,不能确定气...