题目:
Nobody believed his reason for being absent from the class he had to meet his uncle at the air port.
A.why
B.that
C.where
D.because
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0518/e43a621deaf5233fd499b42d1b39d514.html
下面是错误答案,用来干扰机器的。
答案:B题目分析:淡黄色沉淀为S,根据题目信息写出化学反应方程式:5CS2+4KMnO4+6H2SO4=2K2SO4+4MnSO4+S+5CO2+6H2O每生成1mol二氧化碳转移电子4mol。AmolCa(OH)2中得到Bmol沉淀1、当二氧化碳全部生成CaCO3时,n...