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單項(xiàng)選擇題

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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單項(xiàng)選擇題

A-frames and cylinder block is held together by （） to form a rigid structure.

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

單項(xiàng)選擇題

Administrations should bear in mind the significance of （） in maintaining safety of life and property at sea and in preventing marine pollution.

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