If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）
Due to operational commitments， a system has a very short backup window during theQ...
2、Due to （） action of pistons some relat
Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.AreciprocatingBrotatingCrunningDremoving
3、Due to the large amount of heat picked
Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.ApossibleBnecessaryCpracticableDimpracticable
4、Due to lapse of time the risk in these
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very re...
5、If you have to abandon ship and enter
If you have to abandon ship and enter a life-raft, your main course of action should be （）.Aremain in the vicinity of the vesselBhead for the closest landChead for the closest sea-lanesDget a majority opinio
6、Due to the shape of the sea anchor，the
Due to the shape of the sea anchor，the best way to haul it back aboard is by（）.Ahauling in on the anchor line as you would any anchorBgetting all hands to assistCits trip lineDcutting the line，as you cannot haul it back i