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A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （）

A、vacuum drag from the auxiliary condensate system

B、individual vacuum pumps

C、a single non-condensing air ejector

D、a two stage air ejector

时间：2022-01-13 21:15 关键词：船舶电气与船舶安全水路交通运输技能考试海船船员考试

答案解析

D

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