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• If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）

  A . backfire through the air intakes B . develop less power under load C . have high firing pressures D . lift its cylinder relief valve

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• The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）

  A . remove any air that may accumulate in the system B . take out unpleasant fumes from the refrigerant C . vent off excess refrigerant in an emergency D . permit opening the refrigerating system for cleaning and inspecting

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• Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

  A . cylinder liner B . coupling flange C . cylinder cover D . piston crow

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• （）is from baseline to top of the upper deck breadth at the ship’s side amidships.

  A . Extreme draft B . Molded draft C . Extreme depth D . Molded depth

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• A radar display in which North is always at the top of the screen is a(n)（）.

  A . unstabilized display B . stabilized display C . composition display D . relative display

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• A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.

  A . relative display B . composite display C . stabilized display D . unstabilized display

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• What term indicates the line drawn at the top of the flat plate keel（）.

  A . Base line B . Molded line C . Designer's waterline D . Keel line

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• Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

  A . Control the amount of lube oil burned in the combustion chamber B . Transmit heat from the piston to the cylinder liner C . Prevent damage to ring groove inserts by acting as a heat dam D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

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• Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.

  A . thinner B . thicker C . smoother D . rougher

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• At the top of the A-frames there is a strong cast iron frame called （）.

  A . cylinder liner B . cylinder cover C . the gear box D . the scavenging box

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• If you are nervous on the stage, you can just look at the top of the heads or imaging your audience are vegetables.

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• If your career is at the top of you ____ list then you might decide against having kids.

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• Not until I shouted at the top of my voice_____his head.

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• What can you see to the west of the pyramid When you are standing at its top?

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• When decision-making authority resides at the top of the organizational chart as opposed to being distributed throughout lower levels, an organization is:

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• At first Elsa did not know why her father had brought her to the top of the tower.

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• Living here at the top of the mountain with no one else near you must be very ______.

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• At least 15 states have offered financial aid, typically _______ enroll top students in the states’ public institutions.

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• Only by shouting at the top of her voice____.

  A．she was able to make herself hear B．was she able to make herself hear C．she was able to make herself heard D．was she able to make herself heard

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• The boy sat at the top of the hill, looking at the valley______.

  A．under B．above C．up D．below

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• Going around at the top of the mountain, we watched the fog______from the valley below; it seemed that we had entered a fairyland.

  A．descend B．decrease C．arise D．ascend

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• I was amazed at the beauty of the mountain when I reached the top.

  A．excited B．astonished C．happy D．shocked

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• We______at the top of the mountain now but for this awful weather.

  A．would be B．could be C．should be D．will be

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• The hotel also has a special-food restaurant at the east of the courtyard where famous local dishes are prepared by the top chefs．

  A．宾馆还有一个位于庭院东侧、由高级厨师为您准备著名地方菜的餐厅。 B．宾馆大厅的东侧，有一个由高个子厨师烹制地方名菜的特色餐厅。 C．宾馆还有特殊风味餐厅，位于庭院东侧，由名厨烹制著名地方菜。 D．在宾馆东侧的特色风味餐厅内，大厨正为您烹制各种地方菜。

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