下图中,当产品上带孔的柱子3mm≤d≤10mm时,可用()方式顶出。
A.司筒
B.顶出块
C.推板
D.顶针
参考答案:D
The world is ____________ five continents.
A.divide by
B.separated from
C.made up of
D.divides into
电磁铁吸合行程越小,制动瓦张开的间隙就越大。