铁路词汇3-时尚资讯——收集最潮流最热点的时尚资讯... ... 砂道碴 sand ballast 底碴 subballast 道床厚度 thickness of ballast bed；depth of ballast ...
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Sub-ballast 底层道渣
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Lower turbines should, together with clever design and material selection, help reduce the turbines' weight, and thus their need for ballast, which in turn should reduce sub-sea costs.
BBC: Floating challenge for offshore wind turbine
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