It seems very difficult to ________ the child crying. Please take him to his mother.
A:stop
B:keep
C:make
3x+____=28 ____-1.5x=4
一天早晨的气温是﹣6℃,中午比早晨上升6℃,中午的气温是+6℃.
如图所示,一物体在外力F的作用下,以5m/s的速度做匀速直线运动,如果突然力F撤去,则物体( )