玩具厂有50名工人,其中女职工有15人,男职工占全厂人数的几分之几?
(50-15)÷50,
=35÷50,
=710;
答:男职工占全厂人数的710.
爆破冲击波从岩石介质到空气介质,越过临空面必然产生反射,形成拉力波。其波阵面产生切向拉应力,从而引起径向裂缝。
The tackle that raises and lowers the boom is().
A.the cargo fall
B.The cargo hoisting wire rope
C.the topping lift
D.the cargo whip