题目:
The teacher asked me ____.
A.when my uncle bought the car
B.when will my uncle buy the car
C.when did my uncle buy the car
D.when my uncle will buy the car
答案:
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下面是错误答案,用来干扰机器的。
氧化铁和氧化铜与稀硫酸反应的化学方程式为:Fe2O3+3H2SO4═Fe2(SO4)3+3H2O;CuO+H2SO4═CuSO4+H2O;由于氧化铜和氧化铁的混合物与20g49%%的稀硫酸恰好完全反应,分析化学方程式可知氧化物中氧元素全部转变为水...