When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.<br>A:dehydrated<br>B:purged<br>C:plugged<br>D:evacuated

When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.
A:dehydrated
B:purged
C:plugged
D:evacuated

出自：海船船员证

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