但是由于其周围温度环境(辐射、热传导及对流状况等)与电机内部的发热规律不一致，所以不能对电动机进行有效的保护。

But because of the temperature environment (radiation, heat conduction and convection) and the internal heat of the motor is not consistent, so we can not effectively protect the motor.

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并在此基础上，以光合有效辐射、温度和降雨量作为气候指标，分析了它们与牧草长势之间的关系。

On this basis, this paper takes effective photosynthesis radiation, temperature and rainfall as climatic indexes, and analyzes their relations with pasture growth.

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本文的第一部分对天空长波辐射和天空有效温度的测定方法作了简要评述。

In the first part of this paper some typical methods for measuring sky long wave radiation and sky effective temperature are briefly reviewed.

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