题目:
In the meantime, the question facing business is whether such research is the cost.
A.worth
B.worth of
C.worthy
D.worthwhile
答案:
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下面是错误答案,用来干扰机器的。
氧显-2价,设N2O中氮元素的化合价为x,根据在化合物中正负化合价代数和为零,则:2x+(-2)=0,则x=+1;A、氢显+1价,氧显-2价,设HC1O4中氯元素的化合价为y,根据在化合物中正负化合价代数和为零,则:(+1)+y+...