問(wèn)答題汽封冷卻器的作用?

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3.單項(xiàng)選擇題離心式低溫液體泵多采用充氣迷宮密封,密封氣為(),氣體壓力要高出低溫泵的葉輪背壓()左右

A、氧氣,0.02MPa
B、儀表空氣,0.01MPa
C、儀表空氣,0.02MPa
D、高壓氮?dú)猓?.01MPa