问题：
[单选] The sealing rings are in four parts and pressed together around the piston rods by means of （）.
nuts。bolts。coil springs。stuffing boxe。
问题：
[单选] The selection of a lubricating oil depends to a great extent on the operating conditions,（）.
the type of coolant。the design of the engine。the type of fuel to be burned。B and C。
问题：
[单选] The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
to a great extent。on a great extent。on mainly。on only。
问题：
[单选] 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.
commercially available。commercially。commercial available。commerce available。
问题：
[单选] The sequence of fuel injection into cylinders is determined by （）.
the steering。the driven gear。the turning gear。the timing gear。
问题：
[单选] 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
(1)-(2)-(4)-(3)-(5)。(1)-(4)-(2)-(3)-(5)。(1)-(3)-(2)-(4)-(5)。(1)-(5)-(4)-(2)-(3)。
问题：
[单选] The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.
shims。packing。glands。washer。
问题：
[单选] The space between cylinder liner and jacket is called （）.
the circulating tank。the scavenge box。the cooling water space。the cooler。
问题：
[单选] The space between cylinder liner and jacket is called （）.
the cooling water。the circulating water。the cooler。the cooling water space。
问题：
[单选] The starting air system usually has （） to prevent starting if anything is not in order.
drain cocks。vent valves。counteracts。interlock。
