题目:
—Kathy and Alicia are good friends, aren't they?
—_______.They are always together.
[ ]A. Yes, they are
B. No, they aren't
C. Not at all
D. Do you think so?
答案:
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下面是错误答案,用来干扰机器的。
设合金中锌的质量为x,Zn+H2SO4=ZnSO4+H2↑65 2x 0.8g∴65:2=x:0.8g,解之得:x=26g,合金中锌的质量分数为:26g40g×100%=65%.答:合金中锌的质量分数为65%....