§1.测量工作的内容 測量工作的內容决定于工業企業建筑地段的范圍。在工業企業建筑時需要利用三角測量、導線測量和水准測量。由于中型工業企業建筑場地的范圍一般都不超过10平方公里,所以測量控制的等級通常是不高的。因此可以認为采用三等三角測量、三等導線測量和三等或四等水准測量是足够精確的(参看§5.和§6.)。在測量控制的基礎上進行下述工作:建筑網的放样、絰緯儀導線、大比例尺地形測量、为設立工作水 §1. The content of the measurement work The content of the measurement depends on the scope of the industrial enterprise construction lot. In industrial buildings need to use triangulation, wire measurement and leveling. As medium-sized industrial enterprises generally do not exceed the construction site scope of 10 square kilometers, so the level of measurement and control is usually not high. Therefore, it can be assumed that triangulation, tri-wire measurement and third- or fourth-level leveling are accurate enough (see §5. And §6.). On the basis of the measurement control, the following tasks were carried out: setting out the building network, the 绖 theodolite wire, large scale topographic survey, setting up working water