通常一个Zigbee网络，一般可以具有（）协调器节点，多个路由节点和多个终端节点
查看答案
以下（）属于UWB技术的特点
A. 抗多径能力强
B. 定位精确
C. 保密性强
D. 成本高
Choose the sentence that you think is more appropriate to serve as a topic sentence.
A. The academic performance of some children becomes poor.
B. Caring for a pet could disrupt a child’s regular studies.
Choose the sentence that you think is more appropriate to serve as a topic sentence.
A. Worries about population pressure are far from new.
B. Worries about population pressure.
Choose the sentence that you think is more appropriate to serve as a topic sentence.
A. There are five easy steps in changing a tire.
B. Steps in changing a tire.
微信支付 
支付宝支付