The regulating valve is a very important component in the control system of oil pipeline , and its flow property will affect the control level.

调节阀是输油管道控制系统的重要组成部分，其流量特性对控制质量影响很大。

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The construction of underground pipeline network information system is rapidly improved now, but the level of supervision remains low and unchanged.

地下管网信息系统建设在国内正处于快速增长的态势之中，但是监理的水平和技术却相对停滞。

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First, with object-oriented thought, we divide the underground pipeline system level to clarify the pipe system hierarchy and rend different level category pipeline data.

首先，根据面向对象的思想，划分地下管线系统层次，理清管线系统数据间的关系，并对管线系统的数据进行分层渲染；

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First, with object-oriented thought, we divide the underground pipeline system level to clarify the pipe system hierarchy and rend different level category pipeline data.

首先，根据面向对象的思想，划分地下管线系统层次，理清管线系统数据间的关系，并对管线系统的数据进行分层渲染；

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