Page 52 - كتاب النشاط لمادة الكيمياء الصف التاسع
P. 52

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400 15.2

390 15.0

380 14.8

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370 14.6

360 14.4

350 14.2

340 14.0

330 13.8

320 13.6

310 13.4

300 13.2

290      1900  1920  1940          1960  1980  2000       13.0
   1880                                              2020

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