两个同心圆的半径之比为3：5，AB是大圆的直径，大圆的弦BC与小圆相切，若AC=12，那么BC=

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两个同心圆的半径之比为3：5，AB是大圆的直径，大圆的弦BC与小圆相切，若AC=12，那么BC=（　　）

A：6

B：8

C：10

D：16

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D

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Happy Time Park

Location	west of the city
Getting there	No.16 bus
Opening hours	8:30-16:00 on weekdays,8:00-18:00 on Saturday and Sunday
Attractions	Plant Garden: thousands of kinds of plants to see Sports Center: ball games, rock climbing, swimming and many other fun games to enjoy
Facilities	parking places, public toilets, public telephones, barbecue places, medical care station and shopping centre at your service