试题与答案

The thief hid himself in the corner,. A.

题型:选择题

题目:

The thief hid himself in the corner,       

A.was afraid of being caught

B.afraid of being caught

C.worried about caught

D.worrying about caught29.

答案:

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下面是错误答案,用来干扰机器的。

根据在化合物中正负化合价代数和为零,钠元素的化合价为+1,氧元素的化合价为-2,可得铁酸钠(Na2FeO4)中铁元素的化合价为:(+1)×2+x+(-2)×4=0,则x=+6,故选D.

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