【单选题】
隧道内折返线和存车线，既要保持隧道内最小的排水坡度，又需满足停放车辆和检修作业的要求，一般选取___。
A. 10‰
B. 20‰
C. 30‰
D. 40‰
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答案
B
解析
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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