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单项选择题离心式低温液体泵多采用充气迷宫密封,密封气为(),气体压力要高出低温泵的叶轮背压()左右

A、氧气,0.02MPa

B、仪表空气,0.01MPa

C、仪表空气,0.02MPa

D、高压氮气,0.01MPa

  • B
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