以LJ21E可编程流量演算仪取代模拟式流量测量和积算仪表，可使系统精度优于0.8%。
By replacing the analog flow measurement and totalizing instrument with LJ21E programmable flow calculator, the system accuracy will be better than 0. 8%.
以LJ21E可编程流量演算仪取代模拟式流量测量和积算仪表，可使系统精度优于0.8%。
By replacing the analog flow measurement and totalizing instrument with LJ21E programmable flow calculator, the system accuracy will be better than 0. 8%.
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