The paper analyses the concept, constitution and calculation methods of the costs of the human resources of the teen-aged players, which has the theoretical and practical significance.
本文分析研究了青少年运动员人力资源成本的概念、构成及计量方法，有一定理论与实践意义。
Mainly analyses several cases of signal level variation in CATV system, and also points out practical methods to be consulted by workers in CATV system.
就电缆电视系统信号电平变化的几种情形作系统的理论分析，并指出解决办法，供广大有线电视系统工作人员参。
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