单项选择题
A.shaft and impeller B.motor and pump shaft C.casing and impeller wearing rings D.lantern ring and impeller
In a radial piston pump, reversal and control of fluid ...
单项选择题In a radial piston pump, reversal and control of fluid flow are accomplished by moving the （）.
A.central valve B.radial plunger C.floating ring D.cylinder body
Increasing the moisture content of conditioned air is k...
单项选择题Increasing the moisture content of conditioned air is known as （）.
A.moisturizing B.dehumidification C.dampening D.humidification
A reciprocating air compressor is running roughly and v...
单项选择题A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.
A.compressor is overloaded B.motor is overloaded C.foundation bolts are loose D.belts are too tight
