It's shorthand for Dobson Unit. Units of measurement of the level of ozone. measurement of ozone levels. If, for example, 100 du of ozone were brought to the Earth's surface, they form a thick layer of a millimeter.
00:35, 27 November 2012
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بنود
معاجم
متابعين
27
14
64
6
95
10
57
2
1