單項(xiàng)選擇題In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause ().

A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves


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1.單項(xiàng)選擇題Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?()

A.Keeps the refrigerated space cooler
B.Reduces the efficiency of the plant
C.Takes the load off the compressor
D.Has no affect on the system