通风口的保护外壳设计，专用于许多公用水供应系统中的空气释放阀。
VENT GUARD? Is a protective enclosure designed exclusively for the air release valve found in many public water supply systems.
曲柄轴箱通风阀和配有废气帽的空气污染控制阀(的使用)对减少挥发性有机混合物释放有积极作用。
The positive crankcase ventilation valve and gas caps with air-pollution control valves reduce volatile organic compound loss.
曲柄轴箱通风阀和配有废气帽的空气污染控制阀(的使用)对减少挥发性有机混合物释放有积极作用。
The positive crankcase ventilation valve and gas caps with air-pollution control valves reduce volatile organic compound loss.
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