以下文件格式中，______不属于声音文件。

【名词&注释】

应用软件(application software)、操作系统(operating system)、声音文件(audio file)、音频文件(audio file)、图像文件格式(image file format)

[单选题]以下文件格式中，______不属于声音文件。

A. Wavc文件
B. MIDI文件
C. Audio文件
D. GIF文件

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学习资料：

[单选题]Both bus and tree topologies are characterized by the use of multipoint (71) ．For the bus，all stations attach，through appropriate hardware (72) known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the (73) ．A transmission from any station propagates the length of the medium in both directions and can be received by all other (74) ．At each end of the bus is a (75) ，which absorbs any signal，removing it from the bus．（71）

A. medium
B. connection
C. token
D. resource

[单选题]一个C类网络中最多可以使用(29)个IP地址。

A. 256
B. 255
C. 254
D. 253

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