Because of its intimacy, radio is usually more than just a medium; it is __________.

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  A . is an indication of the amount of noncombustible material present in the oil B . indicates the quantity of energy released by burning a unit amount of the fuel C . is useful for determining proper atomization temperatures D . reflects the overall thermal efficiency of the fuel oil service system

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• Moisture should be kept out of an R-12 system because it tends to cause （）.

  A、icing of the automatic controls B、embrittlement of some parts of the automatic controls C、sludge in the lubricating oil D、all of the above

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• The cooling water of the diesel engine should be treated, because it has（）

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• Nylon rope is often used in the makeup of a towline because it（）.

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• Some radio waves（）the surface of the earth because of its（）.

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• At first it was all right because there was plenty of clean air, land and (2) .

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• By Creativity, we mean language is resourceful because of its duality and its recursiveness.

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• It is very difficult to stop the cultivation of marijuana because _____.

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• 4 Choose the correct word.► I took my umbrella because/so it was raining. because1 I stayed at home because/because of the weather. ____

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• Tom decided to take the job because of its _____working hours.

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• Because semiconductor has two kinds of carriers, it has better conductivity than conductor

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• __________of them knew about the plan because it was secret．

  A.Some B.Any C.No one D.None

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• Because of its intimacy,radio is usually more than just a medium; it is_____.

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• Calcium hydroxide is generally the material-of-choice in vital pulp capping because it（

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• _________of them know about the plan because it is secret.

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• Portfolio approach is considered an extension of the monetary approach because it

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• Jessica likes Chicago because it is one of the largest cities in the US.

  A．Right. B．Wrong. C．Doesn't say.

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• Over a million people visit Hawaii（夏威夷) each year because of its pleasant weather and

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• Because of its ______nature, no one knows the exact size of the underground economy.

  A．subversive B．subterranean C．mysteriousChidden

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• Transportation is one of the most significant areas of（）because of its impact on customer service and the firm′s coststructure.

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