A:How old are you ?
B:Happy Birthday to you.
C:This is for you.
一架飞机从我国汕头起飞,沿着北回归线自东向西绕地球飞行一周,经过的大洲和大洋依次是( )
如图所示,物体的长度是____ cm,弹簧秤的示数是____ N.