问题：
[单选] The starting air system usually has （） to prevent starting if anything is not in order.
stop valves。interlocks。non-return valves。air vent。
问题：
[单选] The successful operation of any engine or machine and （） depend on effective lubrication.
their no trouble period。their freely trouble period。its free trouble life。its trouble-free life。
问题：
[单选] The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine’s （）.
inlet valves。exhaust valves。emergency valves。run-return valve。
问题：
[单选] The term （） refers to one complete sequence of operations required to produce power in an engine.
diesel engine。stroke。cycle。compression ratio。
问题：
[单选] The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
shut。closing。opened。closed。
问题：
[单选] The vessel is out of harbor and in “Full Ahead”We are going to run fuel oil instead of （） and open the fuel oil heater steam valve.
heavy oil。lube oil。fuel oil。diesel。
问题：
[单选] The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.
the engines speed。the engines load。the fuel oil temperature。the fuel oil flow。
问题：
[单选] The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.
temperature。pumping rate。pressure。heat。
问题：
[单选] The viscosity regulator controls the fuel oil temperature （） provide oil at the correct viscosity for combustion.
in order that。because of。in order to。owing to。
问题：
[单选] The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.
friction。collision。inertia。resistance。
