题目内容

Which cables are used to transfer information for the Internet over long distances at high speeds?

A. telephone lines
B. Ethernet cables
C. fibre optic cables

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Which device allows several computers on a local network to share an internet connection?

A. an ADSL port
B. a router
C. an Ethernet port

Which device serves as a common connection point for devices in a wireless network?

A. wireless access point
B. wired router
C. wireless adapter

Bluetooth is a wireless technology that uses radio waves to transmit data over

A. long distances
B. medium-range distances
C. short distances (ten meters or less)

按自然数从小到大为标准次序，则51243的逆序数是（）。