题目:
A Bluetooth device can be either a master or a slave and any of the devices within a (1) can be the master. There is only one master and there can be up to (2) active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to (3) parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to (4) mode before it can become active. Within a network, all (5) communications are prohibited.
1()
A.Wireless LAN
B.Wireless MAN
C.Cellular radio network
D.Piconet
答案:
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答案:B题目分析:解答本题关键是了解题干材料的意思,即可知反映的是什么历史现象。从“竹枪”、“铜灯”的物件,以及“未闻枪声震天”、“不见烟火冲天”的景象,可知是反映近代中国人民吸食鸦片所带来的危害,...