题目内容
Multifunctional devices (MFDs) are used to capture as well as play back recorded sounds.
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Telephony, also known as Internet telephony, is the VoIP application that uses the Internet rather than traditional telephone lines to support voice communication.
Skype provides audio and video service that requires the installation of special hardware and software.
Unmanned aerial vehicles (UAV) are too expensive for anything but military budgets.
请将下列各朝代与扬州盐业发展的时期对应连线。
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