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当前学科：本地通信线路工程设计规范
题目：
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道沟开挖（含路面开挖）按测量划线开挖，管道中心线偏差不得大于（）mm。管道沟开挖应顺直，沟底平整，沟坎、转弯应平缓过渡
A . 50
B . 100
C . 150
D . 250
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