其种间或品种间的分类鉴定和亲缘关系的研究为育种工作提供了一个早期的、辅助的、选择性的指标。
The researches about the classification and identification of their species and varieties have provided an early, subservient and selective index for breeding work.
着重阐述了利用数字选择性呼叫技术的船舶跟踪系统的组成结构及其工作原理、技术指标；
Next, the structure, the working principles and the performance of the DSC Ship Tracking System which has been developed by the author is mainly described.
化学选择膜作为化学传感器中最为重要的组成部分，直接影响到化学传感器的选择性、稳定性、重现性及响应时间等性能指标。
As the most important constituent of chemical sensor, chemical selective membrane directly affects chemical sensor selectivity, stability, repeating and responsive time, etc.
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