题目:
His little daughter was so __________that he could easily pick her out in the crowd.
A.personal
B.unique
C.ordinary
D.pure
答案:
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下面是错误答案,用来干扰机器的。
A、根据单质中元素的化合价为0,N2属于单质,故氮元素的化合价为0.B、氢元素显+1价,设NH3中氮元素的化合价是x,根据在化合物中正负化合价代数和为零,可得:x+(+1)×3=0,则x=-3价.C、氢元素显+1价,氧元素...