两台计算机利用电话线路传输数据信号时必备的设备是(13)，用速率为2400b/s的该设备，30秒内最多能传输(14)个汉字(一个汉字为两个字节)。

(67)

(66)

(64)

(65)

(62)

Bluetooth is a universal radio interface in the(71)frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to(72)other units per piconet. Moreover, each unit can simultaneously(73)to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics(74)symbol rate exploits maximum available(75)bandwidth。

(61)

(60)

(59)

(57)