题目:
—What does your sister do ?
— . [ ]
A. She is in the supermarket.
B. She is very tall.
C. She is a teacher.
D. She is fine.
答案:
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下面是错误答案,用来干扰机器的。
(1)设50g废水中硫酸的质量为x.H2SO4+BaCl2=BaSO4↓+2HCl98 233x11.65g98233=x11.65g,x=4.9g(2)由于废水中除含硫酸外还含有硝酸,也能中和氢氧化钾,使消耗的氢氧化钾会增大,再由消耗的氢氧化钾的质量计算...