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%。
Calculator: a financial calculator is required, of a type that can do discounted cash flow and internal rate of return calculations.
计算机：你必须有一部计算机，而且是附计算折现现金流量及内含回报率财务功能的。
The essay introduces multi-chip calculator communication system based on RS-485 bus, especially MAX-487 chip and the components of the communication system and gives the flow diagram.
介绍了基于RS-485总线的单片机多机通信系统，重点介绍了MAX-487芯片和通信系统的组成，并给出了流程图。
The essay introduces multi-chip calculator communication system based on RS-485 bus, especially MAX-487 chip and the components of the communication system and gives the flow diagram.
介绍了基于RS-485总线的单片机多机通信系统，重点介绍了MAX-487芯片和通信系统的组成，并给出了流程图。
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