减少（Reduction）

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• In using reduction gears to obtain efficient propeller speeds, （）.

  A . they must be located at the after end of the engine B . they can only be used with one engine at a time C . they eliminate the need for controllable pitch propellers D . they are connected to the engine with a flexible coupling

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• The most inefficient method of voltage reduction from the stand point of power loss, is a/an （）

  A . capacitor in series with the load B . inductor in series with the load C . capacitor and inductor in series with the load D . resistor in series with the load

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• The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.

  A . sudden evaporation of wax crystals in the lubricant B . sudden evaporation of entrapped air in the lubricant C . release of refrigerant from the oil/refrigerant mixture D . release of dissolved lubricant from the refrigerant

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• 消声sound attenuation；moise reduction sound deadening

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• Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）

  A . excessive speed B . improper warm-up C . extreme misalignment D . inadequate lubricatio

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• 异化型硝酸还原（dissimilartive nitrate reduction）

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• “3R”指的是Reduction：：“（）”、Replacement：“（）”、Refinementt：“优化”。

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• 标准还原电位（E°ˊ）（standard reduction potential）

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• With（） the engine need not to be aligned with reduction gears or propeller shaft.

  A . Diesel engine propulsion B . Diesel electric propulsion C . Steam engine propulsion D . Gas turbine propulsio

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• Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）

  A . must churn the oil in the sump B . is connected to the propeller shaft C . is driven at the highest RPM D . compensates for alignment variations between the engine and pinion gear

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• In the cargo winch, spur reduction gearing transfers the motor drive to （）.

  A . the toping light B . the board brake C . the fail-safe D . the barrel shaft

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• 罗伯特・希斯提出的危机管理5R模式中的“reduction减缓”指的是（）

  A . 及时预防 B . 有效应对 C . 减低风险 D . 及时恢复

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• Proper operation of the main engine reduction gear set requires the operation to monitor （）

  A . the sump oil level B . oil flow sight glasses C . bearing temperatures D . all of the above

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• The total berth time for a vessel can be reduced through a reduction（）.

  A . of working gangs B . of idle time C . in productivity of the working shifts D . of working hours each working day

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• Wear occurring at the tips of the reduction gear teeth is usually the result of （）.

  A . surface fatigue B . fretting corrosion C . heavy overloading D . gear misalignment

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• Diesel engine mufflers accomplish noise reduction by （）

  A . reducing exhaust gas velocity B . increasing the frequency of gas vibration C . the use of long head pipes D . the use of zinc electrode

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• 同化型硝酸还原（assimilative nitrate reduction）

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• 隔声量sound reduction index

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• 撞击声压级改善量reduction of impact sound pressure level

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• 十倍减少时间（decimal reduction time，D）

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• 国外许多国家都立法对实验动物使用伦理方面的问题进行了规定,这些法律法规的主要依据来自于3R原则。3R是指下列哪些?A.替代(Replacement);B.减少(Reduction);C.重复(repetition);D.优化(Refinement)。

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• You may face a reduction or ________ of benefits.

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• What is the main reason of the reduction of the grizzly bears' number？

  A．Lacking food. B．Forest deceasing. C．The coyote existing. D．Not clear yet.

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• Male liposuction is more popular than male breast-reduction.

  A．YES B．NO C．NOT GIVEN

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