单项选择题

Thermostatic expansion valves can be adjusted for （）.

A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature

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单项选择题

A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability

单项选择题

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

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