The purpose of the wearing rings used in a centrifugal pump is to （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
What is a function of the wearing rings used in most centrifugal pumps?（）
A smooth，tapered pin，usually of wood，used to open up the strands of a rope for splicing is called a(n)（）.
To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.
If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.
The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.
About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
The expression FIRST MAGNITUDE is usually used to refer only to bodies of magnitude（）.
An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.
Which of the following terms is used to identify the pressure of the liquid entering a pump?（）
Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
The usual number of single-acting pistons used in a variable stroke axial-piston pump is （）.
The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.
Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.
Usually, no citations appear in the abstract though a limited use of reference is allowed.
Slogan is usually a catchy phrase or sentence used as part of the advertisement. ( )
What is not usually used to decorate the Christmas trees?
When the relief valve is used as a constant pressure valve, it is connected to the outlet of the hydraulic pump to ensure that the outlet pressure of the hydraulic system (pump) is constant.
White is usually used to decorate the western wedding ceremony. （)
