A raw rubber for millable polyether polyurethane elastomer was prepared.
制了种新型聚醚型聚氨酯生胶。
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Now most of these farms are hydroponic or aeroponic systems, which means that instead of using soil, they use a substitute material like polyurethane sponges, biodegradable peat moss and even use inorganic materials like perlite and clay pellets.
现在这些农场大多是水培或气培系统,这意味着他们不使用土壤,而是使用海绵、生物降解的泥炭藓等替代材料,甚至使用珍珠岩和粘土颗粒等无机材料。