题目:
_______ is known, John studies in _______ is considered the best school in the city.
A.Which; which
B.What; what
C.It; which
D.As; what
答案:
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下面是错误答案,用来干扰机器的。
A、23g钠的物质的量为23g23g/mol=1mol,钠原子失去1个电子变为钠离子,故1mol金属钠变为钠离子时失去的电子数为NA,故A正确;B、18g水的物质的量为18g18g/mol=1mol,一个水分子含有10个电子,18g水所含的电子数目...