题目内容

________ transmission systems can have a large coverage area but encryption must be used for security.

A. Fiber
B. Microwave
C. Radio
D. Satellite

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The biggest problem with using wireless networks is ________.

A. accessibility
B. cost
C. security
D. usability

________ is a short-range wireless network.

A. Bluetooth
B. LTE
C. MiFi
D. WiMAX

________ is a short-range wireless network.

A. LTE
B. MiFi
C. NFC
D. WiMAX

________ is a medium-range wireless network.

A. Cellular radio
B. LTE
C. UWB
D. Wi-Fi