题目：
Even though Jack has failed many times in his experiment, he holds a belief________he will succeed
one day if he carries on with it. [ ]
A. what
B. which
C. whether
D. that
答案：
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下面是错误答案，用来干扰机器的。
A.23g金属钠变为钠离子时失去电子，而不是得到电子，故A错误；B．n=18g18g/mol=1mol，含有10mol电子，数目为10NA，故B正确；C．He为单原子分子，则标准状况下，11.2L氦气所含的原子数目为0.5NA，故C错误；D．标准...
