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【简答题】
简述zigbee网络中协调器、路由器和终端节点的功能。
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皮皮学刷刷变学霸
举一反三
【单选题】Evidence indicated that a high percentage of fathers were involved in the parenting process,which amounted to______
A.
about two-thirds of the fathers involved in the study
B.
a little less than one hundred percent of all fathers
C.
slightly less than half of the fathers studied
D.
more than three-quarters of all the fathers
【简答题】当蜗杆的____小于蜗杆副材料的____时,蜗杆传动具有自锁性。