如图,P1、P2、P3这三个点中,在第二象限内的有( )
A:P1、P2、P3
B:P1、P2
C:P1、P3
D:P1
需鉴别的物质
方法
A
吸入的气体和呼出的气体
观察颜色
B
氧气和空气
闻气味
C
铁粉和炭粉
用磁铁
D
矿泉水和蒸馏水
过滤后,观察是否有杂质残留在滤纸上
You can visit Hong Kong in ______ season because there are many modern shopping malls there.
These yellow dresses are very nice. I hope to have _____________.