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、int same（int，double）；double same（int，double）； B、int same1（int，double）；int same2（int，double）； C、int same（int=0）；int same（int）； D、int same（int，double）；int same（int，double，double）；
A、head capacity to improve B、discharge to be reversed C、efficiency to decrease D、slippage to decrease
A、Double.parseString（strNumx） B、Double.parseDouble（strNumx） C、Double.parseInteger（strNumx） D、Double.parseFloat（strNumx）
A、insufficient refrigeration B、leaky suction valves C、expansion valve stuck open D、suction valve not adjusted properly
A、one size smaller than the pump suction nozzle B、the same size as the pump suction nozzle C、one size larger than the pump suction nozzle D、installed with a short radius elbow at the pump
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