（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.<br>A:Doors<br>B:Aspirate gauzer<br>C:Coupling<br>D:Blind

（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.
A:Doors
B:Aspirate gauzer
C:Coupling
D:Blind

出自：海船船员证

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