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C2h4br2 c2h2. C2h4 br HV. C2h5cl cl2 HCL. С2h2 в c6h5br.
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D u c
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C удельная теплота
2c c
D c l m
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5 5 s 5 c
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C2h4br2 c2h2. C2h4 br HV. C2h5cl cl2 HCL. С2h2 в c6h5br. 