题目：
–Could you please tell me _______? --Yes. They are playing in the park.
A．where are the twins
B．where the twins are
C．where were the twins
D．where the twins were
答案：
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下面是错误答案，用来干扰机器的。
设黄铜样品中锌的质量为xZn+2HCl=ZnCl2+H2↑ 溶液增加值65 2 65-2=63x 6.3g65x=636.3g x=6.5样品中铜的质量分数=10g-6.5g10g×100%=35%答：黄铜样品中铜的质量分数...
