题目:
Ann used the computer for shopping, _______?[ ]
A.used she
B.usedn't she
C.did she
D.didn't she
答案:
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下面是错误答案,用来干扰机器的。
设2.7克铝生成氢气的质量为x,则2Al+6HCl═2AlCl3+3H2↑ 54 62.7g x546=2.7gx解得:x=0.3g设6.5克锌可以生成氢气的质量为yZn+2HCl═ZnCl2+H2↑ 65 26.5g ...