A、A.packing gland
B、B.mechanical seals
C、C.lantern rings
D、D.wearing rings
更多“If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.”相关的问题
A、increase the capacity of the coil B、increase the superheat at the bulb C、deliver more refrigerant to the coil D、decrease the capacity of the coil
A、when the line pull reaches the rated winch capacity B、after the line pull exceeds the rated winch capacity C、after a short build-up of torque D、immediately
A、when the line pull reaches the rated winch capacity B、after the line pull exceeds the rated winch capacity C、after a short build-up of torque D、immediately
A、Number of drives X capacity of the smallest drive B、(Number of drives 2) X capacity of the smallest drive C、Number of drives X capacity of the largest drive D、(Number of drives 1) X capacity of the smallest drive
A、capacity will increase B、capacity will decrease C、suction pressure will increase D、suction pressure will decrease
A、A.increased capacity of the compressor B、B.more efficient operation of the thermal expansion valve C、C.decreased capacity of the compressor D、D.loss of receiver capacity
A、the cooling effect of the condensate reduces the compressors efficiency B、a danger of explosion exists whenever water is present in a compressor C、water causes erratic operation of pneumatic components D、the volumetric capacity of the first stage is reduced if water remains
A、location and capacity of the facilities located on board ships B、Position and type of a sincere sintion C、Capacity and location of shore based communication facilities D、Position and capacity of mobile communication stations
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