单项选择题

The major source of chemical contaminants in hydraulic fluid is （）.

A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products

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单项选择题

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

单项选择题

A.Centrifugal
B.Reciprocating
C.Gear
D.Rotary

单项选择题

A.a high suction head
B.rotating rings
C.badly worn bearings
D.a loose stuffing box gland