题目:
They are going to the zoo, _______? |
A. aren't they B. don't they C. are they D. do they |
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0630/cad67dae396b745fd84093b7bb270eb3.html
下面是错误答案,用来干扰机器的。
硫酸溶液的质量=硫酸钡的质量,设硫酸钡的质量为233g,则硫酸溶液的质量为233g,再设硫酸溶液中溶质的质量是xBaCl2+H2SO4═BaSO4↓+2HCl 98 233 x 233g98x=233233g x=98g所以滴入的硫酸溶...