假设需要把25盒磁带数据（每盒磁带数据量40GB）从甲地转送到乙地，甲、乙相距1km，可以采用的方法有汽车运输和TCP/IP网络传输，网络传输介质可选用双绞线、单模光纤、多模光纤等。通常情况下，采用 （ ） 介质，所用时间最短。
- A.汽车
- B.双绞线
- C.多模光纤
- D.单模光纤
正确答案及解析
正确答案
解析
25盒磁带数据（每盒磁带数据量40GB），所传输的数据总量为：25?40（GB）=1（TB）有线传输1TB的数据，所用时间均比较长，而采用汽车方式则不用传输数据，以汽车30公里/小时的时速计算，1公里路程需要2分钟。所以选择答案A。
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