A:3:4
B:9:16
C:9:1
D:3:1
甲、乙两物质的溶解度曲线如图所示,下列说法正确的是( )
—Hi, Bob! What's going on over there?
—Oh, Tom and Dick are playing chess, with a crowd of students watching them.
气压带与风带的季节移动是东亚季风形成的主要原因。