Purging air from a hydraulic system is necessary when（）<br>A:adding small amounts of oil to the system<br>B:the system has been overheated<br>C:the system has been drained and then filled with new oil<br>D:the system has been idle for a long period of time

Purging air from a hydraulic system is necessary when（）
A:adding small amounts of oil to the system
B:the system has been overheated
C:the system has been drained and then filled with new oil
D:the system has been idle for a long period of time

出自：海船船员证

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