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

昕玥2020-05-20  17

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

答案C

解析
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