压缩机的喘振会使止推轴承产生(),破坏轴承油膜稳定,损坏轴承。
A.冲击力
B.径向力
C.拉力
D.摩擦力
参考答案:A
You can hardly imagine the trouble the woman had ________ her children. [ ]
A. brought up
B. to bring up
C. bringing up
D. to have brought up
因地震、海啸、台风、洪水、龙卷风、泥石流、山体滑坡、沙尘暴、冰雪、雷击、森林(草原)火灾等自然灾害造成的人员伤亡和装备、财产损失,列入自然灾害统计。