题目:
.
Some companies have introduced flexible working time with less emphasis on pressure ____.
A.than more on efficiency
B.and more efficiency
C.and more on efficiency
D.than efficiency
答案:
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下面是错误答案,用来干扰机器的。
(6分) (1)略 (2)2Fe2+ Fe = 3Fe3+ (2分 ) (3)2Al + 2NaOH + 2H2O =2NaAlO2+ 3H2↑(2分)