单项选择题

The sequence of parts in a generally used fuel oil supply system for a main engine is ()
(1)tanks in the double bottom
(2)centrifuges
(3)service tank
(4)settling tank
(5)viscosity regulator

A.(1)-(2)-(4)-(3)-(5)
B.(1)-(4)-(2)-(3)-(5)
C.(1)-(3)-(2)-(4)-(5)
D.(1)-(5)-(4)-(2)-(3)


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1.单项选择题The sequence of fuel injection into cylinders is determined by ().

A.the steering
B.the driven gear
C.the turning gear
D.the timing gear

4.单项选择题The selection of a lubricating oil depends to a great extent on the operating conditions,().

A.the type of coolant
B.the design of the engine
C.the type of fuel to be burned
D.B and C

8.单项选择题The rising of the exhaust temperature in manifold pipe may NOT result from ().

A.too great a loading
B.fouled turbocharger
C.bad combustion
D.excessive air

9.单项选择题The rim of the piston may contain cut-out portions to accommodate () when they open.

A.the gases
B.the air
C.the valves
D.the injectors

10.单项选择题The removal of () from lubricating oil will reduce engine wear and possible breakdowns.

A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities