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D5
在公共杆上架设多副VU波段天线时,上下层天线层间距离大于( )m,左右间距大于2m。
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微波塔和天线到周围建筑物的距离应大于()m。
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The full title of the U.K. is the United Kingdom of ()and ()
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塔桅避雷针与下引线检查时,要求天线必须位于主杆轴线方向锥形夹角60度范围内。()
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Given that the current directory is empty, and that the user has read and write privileges to the current, and the following: Which statement is true?()
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(A0967/98 NOTAMN Q)ZBPE/QOBCE//M/AE/000/999/3745N11237E005 A) ZBYN B)9809300919 C)9812010900EST E)THRESHOLD OBSTACLES ERECTED AT THE POSITIONS: 1) 197DEG(MAG) AND 817M FROM ARP, HEIGHT: 16.4M(AAL). 2) 43DEG(MAG) AND 410M FROM ARP, HEIGHT: 25.2M(AAL). 3) 17DEG(MAG) AND 984M FROM ARP, HEIGHT: 26.4M(AAL). MARKED WITH RED FLAGS AND LIGHTS. ECT AND ECL.)()
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有线电视干线采用架空明线安装时,一般市区杆距为()m。
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电杆杆根周围50厘米内()、(),线路附近()、()、()等危及线路安全的物品。
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public and private colleges and universities and community colleges offer().
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