at the second floor 还是on the second floor

at the second floor 还是on the second floor on the second floor 与 at the second floor 有什么区别? 请问on the second floor 与 at the second floor 有什么区别? in the second floor与on the second floor的区别,谢谢T-T：The computer room is______the second floor.C）A.in B.at C.on D.by the music room is( )the second floor It's on the second floor. the second floor 的中文意思是 对on the second floor 提问 on the second floor用什么提问 A cinema is on the second floor Were you on the second floor? Uncle Wang lives the second floor. he lives on the second floor.就second划线提问、 the seadfood section is on the second floor.对on the second floor进行提问 Where is the art room?It‘s（ ）the second floor.（选序号） A.at B.in C.on in the second floor 与 on the second floor有什么区别? she lives on the second floor.画住on the second floor 画线提问 怎么写 英语翻译( )left.( )the escalator to the second floor.