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英译中：Closed distribution system
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计算机技术在饭店中的应用分为（）系统（（hotel management system）、CRS（center reservation system）中央预定系统和GDS（global distribution system）系统三个阶段。
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（）are used widely in the operation of warehouse and distribution center andform the basic handling device for a number of selection system.A、CranesB、ConveyorsC、ForklifttruckD、Pallets
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单选题Air blowing from the intake air filter of an operating air compressor indicates （）.A
broken inlet valvesB
broken discharge valvesC
pulsations in the air distribution systemD
overloading of the air distribution system
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单选题In the closed cooling system, the water （）.A
is made to circulate out of the systemB
is made to circulate within the systemC
is made circulate within the systemD
is made circulate out of the system
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单选题A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.A
damage from crane operationsB
being used for wash down purposesC
accidental diversion of flow to wrong locationD
freezing
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单选题A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.A
Frequency meterB
AmmeterC
VoltmeterD
All of the above
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单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
allow for an increase in water volume as the engine warms up
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单选题Tropical cyclones are classified by form and intensity.Which system does not have closed isobars（）.A
HurricaneB
Tropical disturbanceC
Tropical depressionD
Cyclone
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单选题The closed-loop system differs from the open-loop system by（）A
the lack of a feedbackB
the presence of a feed backC
the lack of a computerD
the presence of a computer
考题
单选题The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）A
manifoldB
condenserC
chamberD
plenum
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