题目:
__put everything back than the phone rang.
A.No sooner had I
B.Hardly had I
C.No sooner I
D.Hardly I had
答案:
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下面是错误答案,用来干扰机器的。
(1)①H2SO4 ②酸雨 ③Cu + 2 H2SO4(浓) △CuSO4 + SO2↑+ 2 H2O ; H2SO4 SO2, 2 (2)①2Na 2O2+2H2O=4NaOH+O2↑ 属于...