Space-time variation of gravity in Xi'an since 1992 is summarized.
概述了1992年以来西安地区的重力场时空变化特征。
As you perform the method validation for a method, you can confirm that the retention time variation is acceptable.
只要你做了方法的验证,就可以保证保留时间变化是可接受的。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性,系统采用正交多载波方式传输信息。
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