地球的平均半径长度为( )
A:6357干米
B:6371干米
C:6378千米
D:6360千米
A、B、C三种物质各15g,当它们相互反应完成时,生成30g新物质D.若再增加10gC,它们又继续反应到完成时,A与C恰好消耗完毕.则参加反应的A与B的质量比是( )
+ + + =26
+ + + + =31
=____
I like places where the weather is always warm. I hope ____ Hawaii this winter.
This is my family.My mother is a teacher.She is very friendly.My father is a basketball player.He is tall and strong.My uncle is a cook.My aunt is a nurse.I am a student.I have no job.