Trade model considering linked prices of coal and electricity is set up and risk management strategy based on straddle options contract is introduced.

该文首先详细论述了期权及其套期保值功能，然后构建了考虑煤电价格联动的交易模型，并在此基础上引入了基于跨式期权组合的风险管理策略。

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The intended volume of an options contract order may be executed in part unless the order states that it must be executed immediately in full or else canceled.

选择权契约之买卖申报数量，除声明须立即全部成交否则取消外，得为部分成交。

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The contract also provides for options on three additional spacecraft.

该合同也为另外三个太空飞行器提供选项。

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