采用大弹簧压边，可加装（）销，以防止拉深时压边力急剧增加，导致拉深件破裂。
A.定位
B.限位
C.挡料
参考答案：B
数轴上一点A表示的数为﹣5，将A先向右移3个单位，再向左移8个单位，则这个点表示的数是﹙ ﹚．
Nearly all the streets are in straight lines, ________ from east to west. Those ________ run from north to south are called avenues.
A．running; that
B．run; who
C．running; who
D．run; that
