【单选题】【消耗次数：1】
夯管施工的主要设备为夯管锤和空压机、发电机、电焊机等，运输进场的套管长度应比设计穿越障碍的长度加长（）。
①
5～10m
②
1～2m
③
2～3m
④
3～5m
参考答案：
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