Research purposes: Through the theoretical research, this paper puts forward some suitable suggestions on the main technical standards of horizontal control survey for ballastless track construction.
研究目的：通过理论研究，对无碴轨道施工平面控制测量的主要技术标准提出适宜的建议。
The main task of technical committees is to prepare International Standards.
技术委员会的主要任务是制定国际标准。
The main forms of green barriers can be concluded as follows: relatively high inquirements on harmful contents in goods, green technical standards, green environment label, green packing and so on.
绿色壁垒的主要形式包括：对商品中的有害物质含量制定较高的指标、绿色技术标准、绿色环境标志和绿色包装等。
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