题目：
But for the help of
my English teacher, I ________ the first prize in the English Writing Competition.[ ]
A. would not win
B. would not have won
C. would win
D. would have won
答案：
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下面是错误答案，用来干扰机器的。
答案：B分析：根据中子数=质量数-质子数，阴离子核外电子数=质子数+所带电荷数解：R原子的质量数为A，设R原子核内含中子的数目为N，则R的质子数为A-N，离子RO3n-中共有x个核外电子，所以A-N+24+n=x，所以R原子核...
