单项选择题

Which of the following is NOT mentioned as one of the identification system requirements

A．Convenience.
B．Reliability.
C．Low costs.
D．Acceptability.

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单项选择题

The most reliable and convenient identification method in present use is ______.

A．signatures
B．photographs
C．fingerprints
D．magnetic stripes

单项选择题

If the technical problems can be worked out, which method is the most promising

A．Voiceprints.
B．Fingerprints.
C．Photographs.
D．Signatures.

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