This paper introduced the technical of using drilling downward hole from working surfale in protective coat bottom tu pull out goaf gas, and the effects were analysed and summarized.
前言：介绍了在被保护层底板巷向保护层工作面施工下向穿层钻孔，抽采保护层工作面采空区瓦斯的具体做法，并对取得的效果进行了分析总结。
The charcoal works have a different weight, partly due to the black colour, but also because they have a slightly watery sheen from the protective coat of resin, and due to their simple organic forms.
木炭作品的重量不一样，一部分是由于黑色的缘故，但是也因为它们有一层保护性的树脂发出轻微的水样光辉，并且也由于它们简单的有机式样。
The method is to coat a wafer of silicon with a protective layer of silicon dioxide.
其方法是往硅片上涂上一层二氧化硅防护膜。
Thic coat serves as an adhesive between cells and as a protective layer.
这一层负责细胞间的连接，并作为细胞的保护层。
Thic coat serves as an adhesive between cells and as a protective layer .
这一层负责细胞间的连接，并作为细胞的保护层。
The coat on neck and shoulders forms a protective mane.
在颈部和肩部的被毛形成具有保护性的鬃毛。
The coat on neck and shoulders forms a protective mane.
在颈部和肩部的被毛形成具有保护性的鬃毛。
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