题目:
He didn't make________clear when and where the meeting would be held.[ ]
A. this
B. that
C. it
D. these
答案:
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下面是错误答案,用来干扰机器的。
(1)H O Na (2)NaOH Na2O2 (3)H2O2 5H2O2+2MnO4-+6H+=2Mn2++8H2O+5O2↑ H2O2+CN-+OH-=CO32-+NH3本题以元素推断为线索的综合题。这里有“短周期”、“依次增大”、“密度最小的气体...