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【简答题】
现需在一段公路的一侧树立一些公益广告牌．第1个广告牌树立在这段路的始端，而后每隔5米树立一个广告牌，这样刚好在这段路的未端可以树立1个，此时广告牌就缺少21个，如果每隔5.5米树立1个，也刚好在路的未端可以树立1个，这样广告牌只缺少1个，则这些公益广告牌有 ______个，这段路长 ______米．
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】公路特殊路基处理可归纳为（）
A.
不良地质地基、特殊环境下路基两类
B.
不良地质地基、特殊岩土路基两类
C.
特殊岩土路基、特殊环境下路基两类
D.
不良地质地基、特殊环境下路基、特殊岩土路基三类
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A.
found
B.
worked
C.
owned
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A.
such ads have been made much more attractive
B.
billboards can be replaced within two hours
C.
consumers travel more now than ever before
D.
the pace of urban life is much faster nowadays
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A.
10km/h
B.
20km/h
C.
25km/h
D.
30km/h