——Did you go to Jufeng Temple ___ the Peach Blossom Festival(桃花节)?——Yes. The flowers were beautiful and bees were flying ____ them.
I want to in the sun.
小何在水平地面上,用100N的水平推力推动重为500N的物体匀速直线前行了2m,则该物体受到的摩擦力是____N;此过程中重力做的功为____J.