单项选择题

Which of the following methods is the least psychologically acceptable

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