Which one of the followings might not be employed to create vacuum for flash type evaporator? （）<br>A:high-pressure steam-driven air-ejector<br>B:motor-driven vacuum pump<br>C:water-motivated air eductor<br>D:centrifuge pump

Which one of the followings might not be employed to create vacuum for flash type evaporator? （）
A:high-pressure steam-driven air-ejector
B:motor-driven vacuum pump
C:water-motivated air eductor
D:centrifuge pump

出自：海船船员证

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