We introduce the futures return vector to replace the single future return, deduce the multiple futures to single cash hedge model to realize the dispersion of basis risk.

引入多个期货合约收益率向量代替单个合约的收益率，推导出多种期货合约对一种现货进行套期保值模型，解决了交叉套期保值的基差风险分散问题。

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Integrated analysis of these results is helpful to strati - graphic interpretation, the analysis of absorption and frequency dispersion, the identification of multiple reflection, and so on.

综合对比这些结果，可用于地层岩性解释、分析吸收和频散作用、以及分辨多次波等。

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The dispersion relation for the low-frequency plasma interchange modes in a hot-electron plasma with line-tying function is solved by using the MHD equ. of multiple species.

用多组份磁流体力学方程导出了有线捆作用的热电子等离子体中，低频等离子体交换模的色散关系；

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