单项选择题

G40必须与G41或G42成对使用。
A、正确
B、错误

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单项选择题

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不定项选择

‏数字视频监控阶段，核心设备是DVR，其主要功能是将模拟视频信号由DVR实现数字化编码压缩并进行储存。

A．正确
B．错误