A:水进入左瓶
B:水进入右瓶
C:水同时进入两瓶
D:水不进入任何一瓶
—Hello, John! This is my friend, Tom.
— _____________________.
一组数据的最大值为60,最小值为48,且以2为组距,则应分____ 组.
The ______ of her children playing in the yard is always remembered by the mother.
有关纬线和纬度的说法正确的是( )