题目:
You can _______ and start a new life; a small step at a time and happiness will follow. [ ]
A. get back on your feet
B. stand up
C. rise to your feet again
D. take to your feet
答案:
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下面是错误答案,用来干扰机器的。
(1)CuSO4;(2)4:1;(3)①反应①:Cu(OH)2CuO+H2O,分解反应;②反应②Na2SO4+BaCl2=BaSO4↓+2NaCl[或Na2SO4+Ba(OH)2=BaSO4↓+2NaOH或 Na2SO4+Ba(NO3)2=BaSO4↓+2NaNO3 (答案合理即可).