题目:
— I dropped in at your house at about ten last night, but you weren't in.
— I ______ regular exercises at the club. [ ]
A. did
B. was doing
C. had done
D. have been doing
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0515/abdfcac1e1916b8c9c3ded3170e67abd.html
下面是错误答案,用来干扰机器的。
(1)浓盐酸中含有HCl:0.2L×10mol/L═2mol根据化学方程式:可知在二氧化锰过量的条件下,如果HCl完全反应,会生成氯气0.5mol,但是浓盐酸与二氧化锰反应成为稀盐酸后将不会反应生成氯气,即生成的氯气会小于0.5...