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.
在3-D环境，室内，室外，角落周围，高低处，该监视系统允许操作人员观察到整个画面和几乎全部的监视安全区域。
The system allows operators to see a total picture and virtually patrol security areas, moving through the 3-D environment, indoors, outdoors, around corners, high, and low.
外部电灯组件：荧光灯安装于通风柜室外部，以提高安全，增加操作寿命以及方便服务。
Exterior light Fixture: Fluorescent lights are mounted outside the fume hood chamber for improved safety, increased operating life and convenient service.
外部电灯组件：荧光灯安装于通风柜室外部，以提高安全，增加操作寿命以及方便服务。
Exterior light Fixture: Fluorescent lights are mounted outside the fume hood chamber for improved safety, increased operating life and convenient service.
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