In the identical working tempt the difference between tempt on the surface and the working tempt is even greater and that reduces the working life of the heating filament.
同样工作温度，丝表面温度与工作温度相差更大，从而降低电热丝的寿命。
In the identical working tempt the difference between tempt on the surface and the working tempt is even greater and that reduces the working life of the heating filament.
同样工作温度，丝表面温度与工作温度相差更大，从而降低电热丝的寿命。
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