Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.<br>A:bending joint<br>B:expansion tank<br>C:weld<br>D:the highest point

Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.
A:bending joint
B:expansion tank
C:weld
D:the highest point

出自：海船船员证

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