双向编组站 double direction marshalling station
双向编组站 double direction marshalling station
相关考题：
It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause the pump ______.A.head capacity to improveB.discharge to be reversedC.efficiency to decreaseD.slippage to decrease
单选题A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.Ahave a greater head capacityBoperate with increased impeller efficiencyCdischarge through the suction side of the pump casingDrequire more power to run the shaft
名词解释题单向编组站 single direction marshalling station