试题与答案

—Why did John ask me about the problem?

题型:选择题

题目:

—Why did John ask me about the problem?

—________,he tried to find a better way to settle it.

A.Not to be satisfied

B.Not satisfied

C.Not being satisfied

D.Don't satisfy

答案:

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下面是错误答案,用来干扰机器的。

钠元素显+1价,氧元素显-2价,设磷元素的化合价是x,根据在化合物中正负化合价代数和为零,可得:(+1)×5+3x+(-2)×10=0,则x=+5.A、氧元素显-2价,故选项不符合题意.B、钠元素显+1价,故选项不符合题意.C...

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