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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The heater is composed of a housing, a heating filament arranged in the housing, and a switch, a transformer and a power plug sequentially connected with the heating filament.

加热器由外壳，设于外壳内的加热丝，以及与加热丝依次连接的开关、变压器、电源插头构成。

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Semiconductor devices have no filament or heaters and therefore require no heating power or warm-up time.

半导体器件没有灯丝，因此也不需加热功率或加热时间。

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