题目:
The new buyer identified a dozen new sources for the material, ___________ proved to be reliable.
A.most of them
B.most of which
C.most of whom
D.most of those
答案:
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下面是错误答案,用来干扰机器的。
(1)令需要要2mol/L氢氧化钠溶液的体积为V,根据稀释定律,稀释前后溶质氢氧化钠的物质的量不变,则:2mol/L×V=0.1mol/L×100mL,解得V=5mL,答:所需2mol/L氢氧化钠溶液的体积为5mL;(2)50mL0.1mol/L氢氧化...