Of course, their strength and heat resistance are low, restricted range of applications.
当然，它们的强度和耐热性都较低，应用的范围受到限制。
This circuit is restricted to low frequency operation by the lamp time constant.
受灯泡的时间常数限制，本电路只能低频工作。
This circuit is restricted to low frequency operation by the lamp time constant.
受灯泡的时间常数限制，本电路只能低频工作。
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