高锰酸钾测定软锰矿时,当溶液中软锰矿变为白色残渣且无气泡冒出时,方可开始滴定。
A. 对
B. 错
1. The bread is ____ than these cakes
A.very delicious
B. more delicious
When they met in the hotel . They talkedand laughed ______A. happily B. happy
A. happily
B. happy
Hainan is a very large Island .It is thesecond ______ island in china.
A. largest
B. larger