This test method covers the determination of the change of resistance with temperature of metallic materials for electrical heating, and is applicable over the range of service temperatures.

本试验方法适用于电热合金随温度变化的测量，亦可用于超过电热合金使用温度范围的情况。

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The heat-resisting bellows diaphragm valve has the advantages of wide applicable temperature range, high fatigue resistance and long service life.

本发明具有适用温度范围广，耐疲劳强度高，使用寿命长。

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