When the measure ship carries out the measure assignment, it provides exact course data via measuring fixed star day and night.
该设备以电视跟踪和测量为基础，主要用于测量船执行海上卫星测控任务和校飞时提供精确的航向数据。
With Beijing Botanical Garden as the study area, the paper employs CVM to measure the non-use value of eco-tourism resources there, and carries out correlative analysis.
本文以北京市植物园为例，采用CVM方法对其生态旅游资源的价值进行了评估和相关分析。
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