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to phrases
Ringelmann chart
ecol.
林格尔曼烟气图
tech.
林格曼图表
表
(测定烟囱排烟量用)
;
林格曼烟污鉴别图
;
烟色比较图
;
标准烟色图
ringelmann chart
ecol.
烟色浓度图
Ringelmann chart:
7 phrases
in 2 subjects
Automobiles
1
Technology
6
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