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【单选题】
在ZigBee网络中存在3种设备类型:协调器、路由器和终端设备,但只能有一个( ),可以有多少( )和多少( ).A.
路由器、协调器、终端
B.
协调器、终端、路由器
C.
路由器、终端、协调器
D.
终端、路由器、协调器
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反馈参考答案：
举一反三
【单选题】There is a crowd of people in front of the house over there. What do you suppose _____ there?
A.
is happened
B.
has happened
C.
happening
D.
to have happened
【简答题】The principal difference between lossless and lossy compression is the __________ or __________ of the quantizer.
【判断题】Interframe compression is lossy while intraframe compression is lossyless
A.
正确
B.
错误
【单选题】—Whose watch is lost? —Mr. Smith's. Look! He _____ it here and there. [ ]
A.
looked
B.
was looking for
C.
looks for
D.
is looking for
【简答题】ADPCM is a _______ (lossy/lossless) compression method.
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