... gradebuilder 斜板推土机 graded bed 粒级层 graded facies 粒级递变相 ...
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normal graded bed sequence 正粒序
There is no graded gravel bed to buy, transport, handle at the job site, and install.
没有分级砾石床的购买、运输、工作现场的处理和安装等问题。
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