单选题:尽头式车道应根据消防车辆的回转需要设置回车道或回车场,回车场的面积不应小于(  )。

题目内容:
尽头式车道应根据消防车辆的回转需要设置回车道或回车场,回车场的面积不应小于(  )。 A.10m × 10m
B.12m×12m
C.15m×15m
D.18m×18m

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