The risk of a motor accident, fire at a factory, theft of goods from a store, or injury at work are all pure risks with no element of gain

车祸、工厂的火灾、商场货物的偷窃、或者是工伤，这些风险都是不能获利的纯粹风险。

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The risk of a motor accident, fire at a factory, theft of goods from a store, or injury at work are all pure risks with no element of gain.

车祸、工厂的火灾、商场货物的偷窃、或者是工伤，这些风险都是不能获利的纯粹风险。

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A novel multi phase permanent magnet motor's mathematical model that combines multi loop theory of AC motor and finite element method of electromagnetic field is proposed in the paper.

将交流电机的多回路理论与电磁场的有限元方法结合起来建立了多相永磁同步电动机的多回路—有限元数学模型。

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