It has much characteristic such as high temperature, large density of heat discharge and controlled atmosphere, and it supplied a new heat source.

它具有温度高、热流密度大、气氛可控等特点，它为钼的提取及冶炼提供了一个新的的热源。

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Methods: to employ an electrothermal drier as a heat source and measure density of grey scale in film with a densitometer.

方法：使用电热干燥箱作热源，用密度计测量胶片上各级灰阶的密度。

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