Satellite on-orbit test is a useful way to monitor satellite platform, on-orbit status and attenuation degree of sensors, and is the premise and base for satellite data's processing and application.
卫星在轨测试是监测卫星平台及其遥感器在轨运行情况及性能衰减程度的有效手段，也是卫星数据处理和应用的前提与基础。
For hydropower station, monitoring system is the base of it's integrated automation, and is the premise of realizing the condition that nobody is needed on duty (or few on duty).
水电站监控系统是实现水电站综合自动化的基础，也是实现水电站无人值班(少人值守)的前提条件。
Secondly, Provide one option price demarcation line judge the method base on the premise that the exchange rate change obeys two forks of tree models.
并在汇率变动服从二叉树模型的前提下给出了一种期权价格界限判断方法；
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