试题与答案

The teacher asked me ____. A.when my unc

题型:选择题

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...

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