单项选择题

The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

A.shims
B.packing
C.glands
D.washers

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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)

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

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The selection of an oil from the （） depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.

A.commercially available
B.commercially
C.commercial available
D.commerce available