若从A、B、C、D、E、F等6名选手中选出4人参加比赛,则甲参加比赛的概率是 .
Our new school was built in a beautiful place, around _____ high mountains.
A.which was
B.it was
C.which were
D.them were
下列有关溶液的叙述正确的是 ( )
A.将植物油与水混合,充分振荡后得到的是溶液
B.配制溶液时,搅拌溶液可以增大溶质的溶解度
C.将120gKCl溶液蒸干得到20gKCl固体,则KCl的溶解度为20g
D.KNO3中混有少量NaCl,可采用降温结晶法提纯KNO3