利用等速采样原理克服动压平衡型烟尘采样仪在寒冷地区不能正常工作的问题
이용등속채양원리극복동압평형형연진채양의재한랭지구불능정상공작적문제
Use equal-speed sampling principle to resolve the question of the sampling instrument of the balanced fumes of the dynamic pressure that can't operate normally in the frigid areas
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