A:more expensive;worse
B:more expensive;not as bad
C:cheaper;good enough
D:cheaper;not as good
某品牌牛奶每盒装有牛奶的质量约为275____ (填上合适的单位),体积为0.25____ (填上合适的单位),由此可以估算出牛奶的密度约为____kg/m3。喝掉一半后,牛奶的密度将____ 。(填“变大”、“变小”或“不变”)
地图上判定方向的方法有____和____。