The main cause that makes Africa highly-concerned internationally is

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  A . realized B . practiced C . maintained D . exercised

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• In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

  A . metal particles loosened by wear B . air when no air cleaners are used C . condensation of water vapors D . breakdown of the lubricating oil by dilutio

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• You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）

  A . large dirt particles in the oil supply B . insufficient lubricating oil and overheating C . normal wear D . water contamination of the lube oil

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• Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）

  A . increase B . decrease C . remain the same D . increase on compression decrease on expansio

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• When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）

  A . to work as overload characteristic B . overspeed C . over mechanical load only D . over thermal load only

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• According to the Robinson Graph, suddenly astern maneuvering of main engine during navigating will cause（）

  A . rapid reduction of ship’s friction force B . shaft system over mechanical load C . sharp growth of the torque of diesel engine D . propeller torque change along J=0 curve

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• （）are mainly caused by the gravitational pull of the moon.

  A . Tides B . Sea C . Swell D . Wind

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• That uniform makes the guards look absurd.  

  A . serious B . ridiculous C . beautiful D . impressive

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• We hope that you wil look（）the cause of the defective goods.

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• What was the main cause of the Second World War?（）

  A . The main cause was big power struggle for control of the world. B . It was the worldwide economic crisis. C . It was the military expansion of Japan,and Germany.

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• The most important factor that causes the wear of the engine parts is （）.

  A . excessive heat B . friction C . oxidation D . high pressure

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• If keep the fuel injection of main engine unchanged when ship is fouled, that will causeⅠ.The speed of main engine to be reduced Ⅱ.Ship speed to be reduced Ⅲ.The resistance torque of propeller to be increased Ⅳ.Trim at stern to increase（）

  A . Ⅰ + Ⅱ B . Ⅰ ~ Ⅲ C . Ⅰ ~ Ⅳ D . Ⅰ + Ⅱ + Ⅳ

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• Changes in direction or speed of the main propulsion units shall be recorded, （）an Administration has determined that the size or characteristics of a particular ship make such recording impracticable.

  A . in addition to B . in addition that C . except for D . except where

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• The emulsion of the oil is mainly caused by （）.

  A . the solid impurities of large particle B . the solid impurities of fine particle C . the water content D . both water and solid impuritie

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• Dr. Lyubomirsky mainly studies the causes of ______.

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• How many soldiers make up the main body of the formation of Pit No. 1?

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• The passage mainly analyzes the differences between shyness and social phobia as well as the causes behind these two problems.

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• Appropriate transitions indicating causes between paragraphs or sentences in your essay can make your ideas flow more smoothly. Which of the following words does not usually indicate cause?

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• The main document adopted by the insured to make claims against the insurer is _ ______.

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• What is the main cause of the company's rising costs？

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• 听力原文：The main policy-making bodies of the EU are the Commission, the Council of Minist

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• Which is the main cause of obesity according to the passage？

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• We can learn from the text that road accidents in Europe are mainly caused by _____.

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