A plastic membrane serves as selective diffusion barrier.

一层塑料薄膜起着选择性渗透屏障的作用.

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It introduces the Diodegration charateristics of Double Degradable Plastic Membrane for fields ( DDPMF ) .

本文主要介绍了双降解 地膜 生物 降解性.

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Fig . 3 . Spectra of three kinds of street lights enveloped by a UV - filter plastic membrane.

图三将三种常用路灯套上 防紫外线 滤膜后之光谱图.

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