双层道床宜按垫层厚度铺足,单层道床铺设厚度宜为(  )。A.100~150mm

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问题 双层道床宜按垫层厚度铺足,单层道床铺设厚度宜为(  )。A.100~150mmB.100~200mmC.150~200mmD.150~250mm

选项 A.100~150mm
B.100~200mm
C.150~200mm
D.150~250mm

答案 C

解析
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