单项选择题

如图，AC BC于点C，BC=a，CA= b,AB= c，与直线AB、BC、CA 都相切，则的半径等于多少？

A、c+b+a
B、c-b+a
C、
D、

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The needle point of heart-shaped suture at the cutting edge cannot be located in the dermis, and the tension reduction point should be a proper distance from the cutting edge to ensure blood supply and negative tension.
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