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, (m), (l) (t). (f), , , , , . : I) , 2) () 3) (, ), (SI, System Internationale). .

, , , , , . , 1/86 400 . 11- 1960 . 1/31 556 925,9747 1900 . 1967 . 13- , 9 192631770 , - 133. , , 1900 . , , .

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