Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the injector when the follower is on the （）of the cam or when the engine is stopped.

A、A.slope

B、B.base

C、C.top

D、D.bottom

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第1题

[单选题] High exhaust back pressure will result in an increase in （）

A、turbocharger efficiency B、engine power output C、carbon deposits on fuel injectors D、cylinder scavenging

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第2题

[单选题] The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.

A、fuel injectors B、exhaust valves C、intake valves D、all of the above

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第3题

[单选题] In a modern three-phase A-Csynchronous brushless generator, the excitation winding is on the rotorThat means （）.

A、The generator needs not excitation B、The winding on the rotor is for inputting excitation current C、There are three phase windings on the rotor D、The generator has brushes

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第4题

[] Only the most sophisticated theories of modern physics can（）this phenomenon.

A、A.account for B、B.count on C、C.account of D、D.count for

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第5题

[单选题] Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

A、cold corrosion of the nozzles B、fuel viscosity for better atomization C、carbon accumulation on the nozzles D、fuel detonation in the cylinders

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第6题

[单选题] Modern New Zealand was founded on the basis of（）signed between Maoris and British settlers in 1840.

A、Maoritanga B、Aotearoa C、the Treaty of Waitangi D、the Treaty of ANZUS