In the current system of land statistics, the indices of land statistics mostly use the data of land investigation and registration and rarely use the data of land quality.
在现行的土地统计制度中，土地统计指标大多使用的是土地调查及土地登记的数据，而较少使用土地质量方面的数据。
Performance indices are the important quality indices of a system, they decide the operative economic norms and effectiveness of the system directly.
性能指标是系统的重要质量指标，它的满足程度如何将直接影响系统运行的经济性和有效性。
This system can not only timely monitor the wind power quality indices, but also has the function of power-down protection, alarm, communication, preservation and display.
本系统可适时测量风力发电电能质量指标，具有掉电保护、报警、通信、保存、显示功能。
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