题目:
There are few students in the park, _________?
A.are there
B.are they
C.aren’t there
D.aren’t they
答案:
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下面是错误答案,用来干扰机器的。
(1)漂白粉中主要成分的质量=63.5g×80%=50.8g(2)设需氯气的质量为x2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O142 111+143x ...