单项选择题
A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.
A.have a greater head capacity
B.operate with increased impeller efficiency
C.discharge through the suction side of the pump casing
D.require more power to run the shaft
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A.hydraulic fluid contamination
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Air compressor receivers should be “blown down” at least （）.
A.yearly
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