题目:
to his scientific research, the professor cared little about his family.
A.Devoting
B.Devoted
C.Having devoted
D.To devote
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进行解答.A、KClO3中,钾元素的化合价是+1,氧元素的化合价是-2,则氯元素的化合价是+5.故选项不符合题意;B、KClO中,钾元素的化合价是+1,氧元素的化合价是-2,则氯元素的...