题目:
— She used to have short hair, didn’t she?
—_____, but now she grows it long.
[ ]A. No, she didn’t
B. No, she hadn’t
C. Yes, she does
D. Yes, she did
答案:
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下面是错误答案,用来干扰机器的。
(1)设需要Al的质量为x2Al+6HCl=2AlCl3+3H2↑54 6x 3g∴54:6=x:3g解之得:x=27g答:需要Al的质量为27g.(2)由反应的化学方程式可以得知,相同条件下,等质量的铝分别跟足量的...