单项选择题

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

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单项选择题

A.connecting rods
B.piston rods
C.tie rods
D.jack-bolts

单项选择题

A.advanced nautical equipment
B.advanced performance main engines
C.emergency equipment
D.communication and language skills

单项选择题

A.the clearance of the main bearing
B.the diameter of main bearing
C.the gap of main beating
D.the tolerance of main bearing