NI数据采集卡控制，用计数器关联DI，使DI能够连续采集-NI data acquisition card controlled by the counter associated with DI, so that DI can be collected continuously

利用NI Labview 软件实现对丁烷物性参数的可视化界面编写。通过建立饱和区数学方程，建立一套程序化的可视化查询软件。以丙烷为基本参照物质，对丁烷基本热力学参数进行推算。结果显示，给定正丁烷压力P 和/或温度T 时，软件能自动判断此时工质状态区，同时推算出焓、熵、潜热、密度的数值-Use NI Labview software interface to visualize the physical parameters of the preparation of butane. Throug