根据模型分解的思想，采用变密度多层地壳密度模型，据此推导了相应的重力异常正演计算公式。
The variable density multilayered crustal model is put forward according to the idea of model decompose in this paper, and the corresponding gravity forward formula is deduced.
根据此模型给出了实际中常遇到的几种情况的瞬时和稳态平均可用度的计算公式。
The formulas for instantaneous availability and limiting steady-state availability are presented for several cases which people meet often in practice.
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