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C2h4 _> ch2br. Ch4-c2h6+h2. C2h4br2 c2h2. C4h6+02.
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D u c
C version
Char c
C удельная теплота
2c c
D c l m
K y c
5 5 s 5 c
Функциональная c
C o n s t
C2h4 _> ch2br. Ch4-c2h6+h2. C2h4br2 c2h2. C4h6+02. 