题目:
—_____ you born?
—In a town near Beijing.[ ]
A. When were
B. Where were
C. Where did
D. Where are
答案:
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下面是错误答案,用来干扰机器的。
(1)用观察法:先观察元素种类和原子个数,先配化合物,再配单质.故:CH4+2O2 点燃 . CO2+2H2O(2)用定一法:把方程式中较复杂的化学式前的系数定为“1”,再配平.故:Fe3O4 +2C 高温 . 3Fe+2CO2↑(3)用观...