单项选择题
A.stuffing box diameter B.direction of rotation of the screws C.pitch of the screws D.type of driving gears
The temperature at which water vapor in the atmosphere ...
单项选择题The temperature at which water vapor in the atmosphere begins to condense is called the （）.
A.dew point temperature B.condensation temperature C.psychometric temperature D.absolute humidity temperature
The tendency for lubricating oil to thin out at high te...
单项选择题The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.
A.low viscosity index B.high viscosity index C.high neutralization number D.low demulsibility quality
Increasing the speed of a rotary pump above its rated s...
单项选择题Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A.Loss of suction B.Increased clearances C.Decreased clearance D.Decreased slippage
