A-frames are mounted on the bed plate and support （） and cylinder block.<br>A:the main bearing<br>B:the cylinder cover<br>C:the entablature<br>D:the sump

A-frames are mounted on the bed plate and support （） and cylinder block.
A:the main bearing
B:the cylinder cover
C:the entablature
D:the sump

出自：海船船员证

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