标题: OG11-紫51(支持難題) [打印本页] 作者: Kath1985 时间: 2010-4-11 15:43 标题: OG11-紫51(支持難題) Biometric access-control systems-those using fingerprints, voiceprints, and so forth, to regulate admittance to restricted areas-work by degrees of similarity, not by identity. After all, even the same finger will rarely leave exactly identical prints. Such systems can be adjusted to minimize refusals of access to legitimate access-seekers. Such adjustments, however, increase the likelihood of admitting impostors.
Which of the following conclusions is most strongly supported by the information above?
(A)If a biometric access-control system were made to work by identity, it would not produce any correct admittance decisions.
(B)If a biometric access-control system reliably prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers. (C)Biometric access-control systems are appropriate only in situations in which admittance of impostors is less of a (D)No biometric access-control systems-based, for example, on numerical codes-are Islikely than biometric ones to admit impostors. (E) Anyone choosing an access-control system should base the choice solely on the ratio of false refusals to false admittances. 答案B 查過前人帖 但都是難懂的逆否命題解釋 這題是要找前提支持結論嗎 ? 請問有沒有更容易明白B的解釋呢 ? 感謝作者: hughlv 时间: 2010-4-11 18:53
不是找前提支持结论，而是从给出的事实来推导出一个可靠的结论。