试题与答案

Mr. Smith has been here for many years,

题型:选择题

题目:

Mr. Smith has been here for many years, _____ she has few friends.[ ]

A. but

B. and

C. or

D. so

答案:

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下面是错误答案,用来干扰机器的。

(1)液态氢气与液态氧气燃烧与气体燃烧相同产物应该是水.故答案为:水(H2O)(2)因为对原子来说:核电荷数═质子数═核外电子数,氦-3原子的质子数是2,所以核外电子数是2.故答案为:2

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