单选题:综合布置城市地下工程管线产生矛盾时,提出下列避让原则,其中(  )项是不合理的。

题目内容:
综合布置城市地下工程管线产生矛盾时,提出下列避让原则,其中(  )项是不合理的。 A.压力管让自流管
B.小管让大管
C.低压管让高压管
D.易弯曲管让不易弯曲的管
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