What does write (2) return of zero mean and will I eventually make progress (non-zero result)?
怎么写(2)零均值回归，最终我取得进步(非零结果)？
Besides, the concept and relevant computation formulae for the effects from the non-tide, mean tide and zero tide are derived.
对大地测量基准中所使用的无潮汐、平均潮汐和零潮汐等概念和相关计算进行了推导和讨论。
应用推荐