本系统中的数字量由PLC控制，数字量主要控制真空系统、烧结炉和化学气相沉积炉中各通气管路中的开关量。
In the system the digital is controlled by PLC, digital is mainly used to control the switch data of pipeline in the vacuum system and metallurgical vessel and CVD vessel.
这一雷达系统可在最大作用距离上辨别出船只、通气管和潜望镜。
The radar system can distinguish the ships, the air tube and the periscope at its largest operation range.
给出了通气管和潜望镜观察系统组合应用的实例。
Examples of snorkel-periscope system combination applications are given.
结合工程实例，说明了加强建筑排水系统通气管道设置后，排水系统工况及室内空气卫生状况可以得到改善。
Based on engineer example, it is illustrated, that modified vent il ation of building drainage system can improve drainage system and indoor air quality.
结合工程实例，说明了加强建筑排水系统通气管道设置后，排水系统工况及室内空气卫生状况可以得到改善。
Based on engineer example, it is illustrated, that modified vent il ation of building drainage system can improve drainage system and indoor air quality.
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