单项选择题

When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.

A.hazy light
B.hazy light brown
C.hazy light blue
D.hazy light grey

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单项选择题

The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.

A.upwards；inwards
B.upwards；outwards
C.downwards；inwards
D.downwards；outwards

单项选择题

The scavenge port inspection should be carried out（）, to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle (complete or incomplete).

A.at the first stop after a long voyage egby anchoring if possible
B.at the first stop after arrival at harbor
C.at the first stop after low load running
D.at the first stop after passing river or canal passage

单项选择题

Always ensure that the turning gear is（）, even at the quay, the wake from other ships may turn the propeller and thus the engine.

A.disengaged
B.engaged
C.assembled
D.disassembled