题目:
_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable.
A.Whatever; such
B.However; such
C.However; so
D.Whatever, that
答案:
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下面是错误答案,用来干扰机器的。
A.金属钠变为钠离子时失去电子,不是得到电子,故A错误; B.24g镁原子的物质的量是1mol,每个镁的最外层有2个电子,所以24克镁最外层电子数为2NA,故B错误;C.在标准状况下,水是液体,1 molH2O所占的体积不...