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【单选题】
在ZigBee技术的体系结构中,具有信标管理、信道接入、时隙管理、发送确认帧、发送连接入断开连接请求特征的是()A.
PHY层
B.
网络/
C.
MAC层
D.
应用框架层
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【单选题】Why are some people not so enthusiastic about green buildings?
A.
Because they do not jump into green building.
B.
Because they fail to move into a green building.
C.
Because they find it more costly to live in a green building.
D.
Because they think that solar panels still cost too much.
【简答题】心理咨询是解决大学生心理问题的重要途径，是高校心理咨询机构的基础性工作。一般认为，心理咨询具有四个方面的功能：（）、（）、（）、（）。
【单选题】A Why do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all? To grow plants need several things． One...
A.
two
B.
three
C.
four
D.
five
【单选题】—Why do you eat so little? —I’m _______ a diet to reduce some weight.
A.
in
B.
on
C.
with
D.
under
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