扫描设备有三种类型：光学扫描器，条码阅读器，和char和标记识别设备。
There are three types of scanning devices: optical scanners, bar code readers, and char and mark recognition devices.
扫描设备有三种类型：光学扫描器，条码阅读器，和char和标记识别设备。
There are three types of scanning devices: optical scanners, bar code readers, and char and mark recognition devices.
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