请在图中画出压缩的弹簧对拇指弹力的示意图．
压缩的弹簧对拇指弹力作用在拇指上，方向水平向右，故画出弹簧对拇指弹力F的示意图如图：
I suggest the problems worthy to be paid attention to at the class meeting.
A．discussing
B．discussing
C．be discussed
D．being discussed
怎样使用操作票？
