大气监测

EPA人员穿著A级防护衣与装备，对危险废弃物样本进行空气检测。（美国环境保护局摄。）

air humidifier

air cooling

primary-air supply aperture, passage

pneumatic lock (compressed-air lock)

closet flushing by means of compressed-air chamber

compressed-air press

air-jet interlaced yarn

temperature controlled air cleaner【环境】;temperature modulated air cleaner【环境】