Which of the following are types of biometric devices used in server rooms？ （）
- A、 Mantraps
- B、 Fingerprint scanners
- C、 CCTV systems
- D、 Retina scanner
- E、 Proxy card readers
正确答案:B,D
答案解析:有
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Which of the following are types of biometric devices used in server rooms？ （）
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