室外操作和点发射和回收。
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。
However, if outdoor temperature is comparatively low, the records preheating aren't required for the welding operation preheating to room temperature.
厨房的室内空气工程系统只可以在有室外空气时操作。
Room air engineering systems for kitchens shall be operated only by outside air.
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