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單項(xiàng)選擇題

桿叉法立桿適用于（）水泥桿

A、8m以上
B、8m以下
C、8.5m

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單項(xiàng)選擇題

郊區(qū)桿距一般定為（）米

A、30-40
B、50-60
C、45-50

單項(xiàng)選擇題

一般市區(qū)桿距定為（）米

A、35-40
B、40-45
C、40-50

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