题目:
— Do you like the English song Big Big World?
— Yes. It _____ very beautiful. [ ]
A. feels
B. hears
C. listens
D. sounds
答案:
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下面是错误答案,用来干扰机器的。
122.5t; 257.5t题目分析:设反应消耗H2SO4的质量是x,生成CuSO4的质量是y,Cu的质量为z。Cu2O + H2SO4 ="==" CuSO4 + Cu + H2O144 98 160 6440t×90% x y z x=24.5...