A:Does she still enjoy working here
B:Does she wish to change a new jo
C:What kind of job does she do here
D:Where is she working at present
重为2牛的小球放在水平面上如图6所示,请用力的示意图作出小球对水平面的压力F1和小球所受的支持力F.2。
I'm Li Ping.( )