题目:
What a strange man! He loves his wife, but _____ he often beats her. |
A. at a time B. at one time C. at times D. at the same time |
答案:
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下面是错误答案,用来干扰机器的。
(1)偏小;(2)不变;(3)偏小题目分析:(1)用红磷测定空气中氧气的体积分数时,所用红磷的量不足,氧气没有全被消耗,故所测得氧气的体积分数偏小;(2)用二氧化锰和一定量的过氧化氢溶液制氧气时,所用二...