在_B_情况下,滑动轴承润滑油的粘度不应选得较高。
A. 重载
B. 高速
C. 工作温度高
D. 承受变载荷或振动冲击载荷
查看答案
动压滑动轴承能建立油压的条件中,不必要的条件是__。
A. 轴颈和轴承间构成楔形间隙
B. 充分供应润滑油
C. 轴颈和轴承表面之间有相对滑动
D. 润滑油的温度不超过50度
The major functions of a warehouse include receipt, storage, packaging, dispatch, housekeeping and so on.
A. 对
B. 错
Refrigerated warehouse can store almost any kind of product.
A. 对
B. 错
Bulk storage warehouse is owned and operated by the company.
A. 对
B. 错
微信支付 
支付宝支付