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The standard divides the dust mask into oil based dust mask KP and non oil dust mask KN; and according to the performance of the dust proof original and the dust proof rate, it is divided into KN90, KN95, KN100, KP90, KP95, KP100 The class filtration efficiency is 90%, 95%, and 99.97%, respectively.
China has high and increasing annual rates of occupational lung diseases such as pneumoconiosis and silicosis. In contrast, Australia and the United States of America (USA) have greatly lowered their annual rates of lung diseases since the 1970s. This paper systematically compared and analysed the multi elements of coal dust management and health management in these three countries to provide
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Pattern Recognition in Pulmonary Tuberculosis Defined by High Content Peptide Microarray Chip Analysis Representing 61 Proteins from M. tuberculosis
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PDF China has high and increasing annual rates of occupational lung diseases such as pneumoconiosis and silicosis. In contrast, Australia and the Find, read and cite all the research you
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It is used by "gas mask" separatists. It is fitted with a Magpul AFG and can be fitted with a reflex sight. [[file:Mossberg 500 tactical.jpg|thumb|none|350px|Mossberg 500 Tactical Shotgun 12 gauge]]
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