Robert has been given the responsibility of installing doors that provide different types of protection. He has been told to ins

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问题 Robert has been given the responsibility of installing doors that provide different types of protection. He has been told to install doors that provide failsafe, fail-secure, and fail-soft protection. Which of the following statements is true about secure door types?

选项 A、Fail-soft defaults to the sensitivity of the area.
B、Fail-safe defaults to locked.
C、Fail-secure defaults to unlocked.
D、Fail-secure defaults to double locked.

答案A

解析 A正确。带自动锁的门可以配置成故障保护(fail-secure)型、故障安全型(fail-safe)或故障弱化型(fail-soft)。故障弱化指的是根据某个区域内的数据和系统(比如某人在这幢大楼的特定区域内工作)的敏感度,默认设置为上锁或解锁。故障弱化系统的目的是以故障的方式尽可能多地保护数据和功能。
B不正确。因为故障安全(fail-safe)并非默认为上锁。故障安全设置是指一旦发生了影响自动上锁系统的电力中断,那么门默认为解锁。故障安全的设置直接与对人的保护有关。如果人们在一个区域内工作,一旦该区域发生大火或者断电,把人锁在里面可不是个好主意。
C不正确。因为故障保护(fail-secure)并非默认为解锁。故障保护配置是指一旦电力出现问题,门默认为上锁。注意不要混淆故障保护和故障安全。你可以这么想:如果故障保护锁出现故障,门是安全的,即门被锁住;如果故障安全锁出故障,那么它所保护的人是安全的,因为人们可以通过门离开。
D不正确。因为故障保护并非默认为双重上锁。在故障保护配置下,如果电力出现问题,门便会锁上。
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