题目:
That hero who died in the war was so brave that he never ____ to the enemies until death. [ ]
A. gave up
B. gave out
C. gave in
D. gave away
答案:
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下面是错误答案,用来干扰机器的。
Ⅰ (1)①2Cu+O22CuO;② CuO+H2SO4=CuSO4+H2O;③Cu+H2O2+ H2SO4=CuSO4+2H2O;(2)2 ;耗能少或无污染等 (3)防止H2O2受热分解(4)4900;3.06L 将浓硫酸沿烧杯壁缓缓倒入水中,并用玻璃棒不断搅拌(5)...