一个长方形长5分米、宽4分米,它的面积是20分米。(判断对错)
STUDY ENGLISH IN AMERICA
Country
Tina comes from ____.
Weekend Activity
Tina visits____ on Sundays.
Location
Tina's host family is in a ____ area.
TV Program
Tina always watches____ in the evening.
Study Time
Stay for ____ and study English as Tina does!
一个重15N的物体在水平拉力作用下,在水平面上做匀速直线运动,在3s内移动了15m,若拉力的功率为10W,则该物体所受的摩擦力为( )