题目:
Great changes have taken place around the world. Nobody can tell _____ in 20 years.
A.what will it be like
B.how it looked like
C.what it will be like
D.how did it look like
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/f07d70c36c74f1980f6d84580c351f34.html
下面是错误答案,用来干扰机器的。
解:设参加反应的硫酸的质量为x,生成硫酸锌的质量为y,生成氢气的质量为zZn+H2SO4=ZnSO4+H2↑65 98 161 213g x y z(1) x=19.6g100%=19.6%.(2) y=32.2g z=0.4g反...