Bosch filter paper smoke meter.
波许烟度计
Development of a new type of light extinction smoke meter
新型消光式烟度计的设计
Application of Filter Type Smoke meter to Diesel Engine Particulate Emission Control
滤纸式烟度仪在柴油机颗粒排放控制研究中的应用
Based on the principle of full flow extinction, this paper excogitated a pocketable opacity smoke meter.
基于全流消光原理，本文研究开发了一种便携消光式烟度仪。
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