In most pumps and pump motors overpacking

题型:单项选择题

问题:

In most pumps and pump motors overpacking the ball bearings full of grease will result in ()

A.moisture emulsification of the bearing grease

B.insufficient circulation and overheating of the bearing

C.proper grease circulation to cool the bearing

D.sliding friction between balls and races

考点:轮机英语船舶电气与船舶安全船舶电气与船舶安全题库
题型:单项选择题

Read and choose. 生活小常识,你都知道吗?

1. What animal has wings?   [ ]

A. A horse has wings.    

B. A duck has wings.

2. Can a sheep fly?   [ ]

A. Yes, it can.    

B. No, it can't.

3. Can a rabbit hop?     [ ]

A. Yes, it can.    

B. No, it can't.

4. What animal can swim?     [ ]

A. A bird.    

B. A fish.

题型:单项选择题

Pentium 4微处理器在保护模式下,存储器分段的大小与段描述符中的粒度控制信息G有关。通常情况下G=0,此时段的大小为

A.64KB

B.1MB

C.4MB

D.4GB

题型:单项选择题

按照剑桥学派的观点,假定其他因素不变,甲国物价水平上升,则()。

A.该国货币量增加

B.该国货币价值下降

C.该国货币价值不变

D.该国货币量减少

E.该国货币价值上升

题型:单项选择题

采煤工作面液压支架顶梁与顶板要平行支护,其最大仰角要小于多少度?

题型:单项选择题

属于屏护装置的有()

A、遮拦

B、栏杆

C、保护网

D、绝缘胶布

更多题库