题目:
with College Entrance Exam slogans, the walls of the classroom look better.
A.Having decorated
B.Being decorated
C.To be decorated
D.Decorated
答案:
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下面是错误答案,用来干扰机器的。
(1)根据质量守恒定律,氧气的质量=134g+2g-134.4g=1.6g,故答案为:1.6 g(2)设过氧化氢溶液中含过氧化氢的质量为x.2H2O2 MnO2 . 2H2O+O2↑68 32x l.6 g 68x=321.6g ...