在线观看人与动牲交视频_夜夜高潮次次欢爽AV女_奇米在线视频观看_欧美精品七区_色悠久久综合网_少妇潮喷无码白浆水视频

美國BGI, Incorporated
美國BGI公司的各種氣溶膠采樣器，是最早通過美國EPA認證的采樣器，也是全球公認的質量最好的標準采樣器；



BGI offers instrumental solutions in aerosol science and technology, ambient particulate sampling, industrial hygiene and air flow calibration. We are an ISO 9001:2008 certified company which mandates that every aspect of our work is under a strict quality standard. This includes: Design, Development, Production, Calibration Laboratory and Client Service. We are dedicated to quality, service and truth.

BGI, Incorporated was founded in 1971 for the purpose of developing and manufacturing instruments for the sampling of airborne particulates -- aerosols. Our sphere of interest has spanned the range from the submicron fraction (Pollak nuclei counter) to 100 micrometers (high volume samplers). The company owns patents on a C.N. counter, the variable resistance calibrator for hi-vols, a unique valve for gas sampling bags and a unique solution to keeping dust from contaminating the lenses of photometers.
The company's interests are wide ranging in the aerosol field, and include occupational health, ambient particulate pollution, aerosol generation, and toxicology.