Air entering an air-cooled refrigeration system is indicated by （）.<br>A:frosting of the liquid line<br>B:higher than normal head pressure<br>C:a clear sight glass<br>D:abnormally cold reefer boxes

Air entering an air-cooled refrigeration system is indicated by （）.
A:frosting of the liquid line
B:higher than normal head pressure
C:a clear sight glass
D:abnormally cold reefer boxes

出自：海船船员证

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