该公司提供一种聚苯乙烯泡沫塑料垫层用来在装运时保护牌匾。
The company provides a styrofoam cushion to protect the tablets during shipping.
研究还发现，不同垫层（塑料片、钢片和铝板）导热性能对刻蚀速率影响很小。
Meanwhile, the difference in thermal conductivity of underlining materials (plastic sheet, steel sheet and aluminium plate) has little effect on the etching rate.
介绍了软土路基的共性，砂垫层、塑料排水板处理方案。
The article introduces the general character of soft soil roadbed and the treatment scheme of sand cushion and plastic drain board.
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