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Substance L melts at 7C-7^{\circ} \mathrm{C} and is a brown liquid at room temperature.
Which temperature is the boiling point of pure L ?

A

77C-77^{\circ} \mathrm{C}

B

7C-7^{\circ} \mathrm{C} to +7C+7^{\circ} \mathrm{C}

C

59C59^{\circ} \mathrm{C}

D

107C107^{\circ} \mathrm{C} to 117C117^{\circ} \mathrm{C}

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