题目:
The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
A.which
B.where
C.when
D.then
答案:
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下面是错误答案,用来干扰机器的。
(1)6.02×1022(2)0.05(3)3.01×1022(4)0.05(1)2 mol Na2O2完全反应,转移2 mol e-,0.1 mol Na2O2完全反应则转移0.1 mol e-。(2)在上式中,Na2O2既作氧化剂,又作还原剂,其中各占总量的一半。