I find （）

A、it difficult for them to finish the job in time

B、difficult for them to finish the job in time

C、they have much difficulty to finish the job in time

D、that difficult for them to finish the job in time

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）

A、absence of engine log book

B、serious corrosion on the hull

C、one page missing in the oil record book

D、paint peeling off some tailings in engine rooms

Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except （）

A、open the indicator cocks

B、supply some LO to cylinder liner wall with lubricator

C、put the fuel handle in the stop position

D、pump up the air bottle

The over-speed trip device installed in some diesel engines is automatically actuated by（）

A、spring force

B、hydraulic pressure

C、centrifugal force

D、mechanical linkage

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）

A、Sludge

B、Gasoline

C、Fuel oil

D、Lube oil

Late fuel injection in a diesel engine is indicated by low firing pressure with （）

A、low exhaust temperature

B、low exhaust pressure

C、mechanical knock in each cylinder

D、black or gray exhaust smoke