本文收集了兰州市区和郊区在取暖期和非取暖期的大气飘尘样品和汽车尾气及烟尘样品。
In this work, samples of airborne particulates, vent gas and smog dust during heating and non-heating seasons were collected in the urban and suburban areas of Lanzhou.
VH系列焊烟净化器，主要收集车间焊接现场所产生的有害致癌焊接烟尘。
VH series ding smoke exhaust systems for economic are special for welding fume Produced by the welding site.
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