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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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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

單項(xiàng)選擇題

When the vessels steering wheel on the navigation bridge is turned, the difference existing between the position of the wheel and that of the rudder is known as （）.

A.proportional band
B.the error signal
C.the reset signal
D.feedback

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