問題詳情

請依下文回答第 46 題至第 50 題         The elevators are the primary means of vertical transportation in most high-rise buildings and potentially can playa vital role in the event of an emergency, such as a fire. The dominant practice around the world, however, is todiscourage the use of elevators during a fire. The major reason for this practice is the unpredictability of the conditionof the emergency and the danger of entrapping passengers as well as rescue workers (e.g. firefighters) in the elevator.        To safeguard the use of elevators in a fire emergency, the US National Institute of Standard and Technology(NIST) is working with the elevator industry to develop new elevators that function during fires. The new elevators aredesigned to be used both as a rescue vehicle, carrying firefighters to the site of the blaze, and as a secondary method(after stairwells) for evacuating building occupants. NIST is investigating software and sensing systems that can adaptto changing smoke and heat conditions so that the elevators can maintain safe and reliable operation during fireemergencies. Such changes could also allow elevators to be operated with remote control from the ground floor duringfires, thus freeing urgently needed firefighters from elevator operation duties. NIST is also testing more reliableelevator-dedicated emergency power systems and waterproof elevator components to be used in the new generation ofelevators.      Besides hardware and software improvements, NIST also incorporates its expertise in virtual reality simulationinto the making of the new elevators. Virtual reality simulations help test scenarios for coordinating firefightingactivities, and for elevator and stairway evacuation. By including elevators into its graphic computer models, NIST willhelp fire safety experts identify the most effective operational procedures for specific fire conditions. Furthermore,NIST fire researchers hope to collaborate on emergency elevator operations standards with colleagues from around theworld. Global standardization should reduce confusion during an emergency, enabling people to take evacuationactions with confidence.
46 What is the main reason for NIST to develop the new elevators?
(A) To secure better cooperation with their colleagues from around the world.
(B) To relieve firefighters of elevator operation duties in a fire emergency.
(C) To improve their research in technology by working with the elevator industry.
(D) To use elevators for rescue and evacuation purposes in a fire safely and effectively.

參考答案

答案：D
難度：適中0.625571
統計：A(8),B(39),C(30),D(137),E(0)

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