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【单选题】
According to the overview，which one is the key technology bring us to precision agriculture?A.
GPS
B.
GIS
C.
RS
D.
Machinery
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反馈参考答案：
举一反三
【单选题】Who checks the bridge clock for accuracy each day?
A.
Third Officer.
B.
Second Officer.
C.
Chief Officer.
D.
Assistant Officer.
【单选题】Who checks the bridge clock for accuracy each day?( )。
A.
third officer
B.
second officer
C.
chief officer
D.
assistant officer
【单选题】【单选】Who checks the bridge clock for accuracy each day?
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assistant officer
【单选题】Who checks the bridge clock for accuracy each day（）.
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assistant officer
【简答题】IEEE 802.11b定义了使用跳频扩频技术的无线局域网标准，它的最高传输速率可以达到【 】Mbps。
【简答题】IEEE 802.11b定义了使用跳频扩频技术的无线局域网标准，它的最高传输速率可以达到11Mbps。802.11a将传输速率提高到______Mbps。
【单选题】Who checks the bridge clock for accuracy each day?（）.
A.
Third officer
B.
Second officer
C.
Chief officer
D.
Assist nt officer
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