Put back the protective aluminium foil or heavy paper covering.
放回起保护作用的铝箔或厚纸。
The paper introduces a protective device for longitudinal tear-proof of belt.
介绍了一种防胶带纵向撕裂保护装置。
An efficient composite protective agent for iron artifacts is studied in this paper.
研究了一种可以成功应用于铁质文物保护的复合封护剂。
This paper offer the algebra ray method to preserve protective coal pillar.
本文采用代数射线法留设保护煤柱。
This paper offer the algebra ray method to preserve protective coal pillar.
本文采用代数射线法留设保护煤柱。
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