【单选题】
The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of（）
A、20
B、40
C、60
D、80
查看正确答案A、Hydraulic oil B、Animal oil C、Light oil D、Fuel oil
搜题
更多“The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of（）”相关的问题
第2题
A、control the back pressure of return oil B、lock the oil lines under some conditions C、change the direction of oil flow D、act as relief valve
第7题
A、A. hydraulic hatch cover B、B. hydraulic release unit C、C. hydraulic oil jack D、D. automatic hatch cover
第8题
A、warm-up allows the hydraulic system to become charged with oil B、warm-up allows the relief valves to be properly tested C、hydraulic strainers operate only during the warm-up period D、hydraulic fluid must be at the proper viscosity
第10题
A、A.provide a reservoir for cylinder lubrication B、B.pump oil into the combustion space for cylinder cooling C、C.prevent excessive lubricating oil consumption D、D.allow hydraulic oil film formation on the cylinder
