However, if outdoor temperature is comparatively low, the records preheating aren't required for the welding operation preheating to room temperature.
但由于室外温度比较低，要求预热到室温后再进行焊接操作的焊前预热可不作记录。
The device is an ideal element for optical computing because of its favorable characteristics, such as simple fabrication technique, low critical power and easy room-temperature operation.
这种器件具有制作工艺简单、阈值功率低和可室温运转等特点，是进行光计算回路可行性研究的理想元件。
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