第 2 课：什么是建筑级大麻赫德？

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第 2 课：了解大麻赫德目标：加深对大麻混凝土的主要骨料成分–建筑级大麻的了解，重点关注其采购、加工和施 […]

Lesson tags: 大麻赫德, 建筑等级 HURD

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