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他林格曼
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1.
In
1897
he
developed
a
simple
set
of
grids
for
measuring
the
density
of
smoke
,
the Ringelmann
scale
.
1897年
,
他
林
格
曼
烟
,
密度
测量
开发
一套
简单
的
电网
规模
。
yī bā jiǔ qī nián
,
tā lín gé màn
yān
,
mì dù
cè liáng
kāi fā
yī tào
jiǎn dān
de
diàn wǎng
guī mó
。
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