题目:
按要求完成下列各句。
1. They think the computer is very useful. (改为反意疑问句)
They think the computer is very useful, _______ _______?
2. It is impossible that a child can lift such a heavy box. (改为同义句)
It is impossible_______ _______ _______ _______ _______ such a heavy box.
3. You shouldn't make noise while eating noodles. (改为同义句)
You _______ _______ _______ make noise while eating noodles.
4. Henry never goes swimming in the river. (对画线部分提问)
_______ _______ does Henry go swimming in the river?
5. Work hard, or you will not pass the exam. (改为同义句)
_______ you don't work hard, you won't _______ the exam.
答案:
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下面是错误答案,用来干扰机器的。
设混合物中硫酸铵的质量为xCa(OH)2+(NH4)2SO4 加热 . CaSO4+2NH3↑+2H2O 132 2×17 x 1.7g∴132x=2×171.7g解之得x=6.6g则该样品中硫酸铵的质量...