题目:
— You have never met a famous film star, ________?
— Yes, I have. I met Maggie Zhang last year.
[ ]
A. did you
B. didn't you
C. haven't you
D. have you
答案:
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下面是错误答案,用来干扰机器的。
(1)设氢氧化钠溶液中含氢氧化钠的质量为X,生成的氯化钠的质量为yNaOH+HCl═H2O+NaCl40 36.5 58.5X 100g×7.3% y4036.5=X100g×7.3% 解得:X=8g 36.558.5=100g×7.3%y 解得:y=11.7g(2)反应后...