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單項選擇題

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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單項選擇題

The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

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

單項選擇題

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