When securing a flash-type evaporator for an extended period of time, you should （）.<br>A:fill the unit with saltwater<br>B:fill the unit with de-scaling compound<br>C:completely drain the unit<br>D:tightly seal the unit to exclude air

When securing a flash-type evaporator for an extended period of time, you should （）.
A:fill the unit with saltwater
B:fill the unit with de-scaling compound
C:completely drain the unit
D:tightly seal the unit to exclude air

出自：海船船员证

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