如图所示，用力F使杠杆在水平位置静止，请画出F的力臂L．
已知支点为O，过点O作力F的垂线段，即动力臂L．如图所示：
We________John's name on the race list yesterday but for his recent injury.
A．will put
B．will have put
C．would put
D．would have put
回力卡环如何减小基牙直接承受的力（）。
A．近中支托与基托直接相连
B．远中支托不与基托直接相连
C．远中支托与基托直接相连
D．近中支托不与基托直接相连
E．无支托与基托相连
支托与基托直接相连