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近年来,以课本习题为载体,通过拓展、引申,演变出许多中考题, 题目,如图1,BC为⊙O的直径,AD⊥BC,垂足为D,
In recent years, with textbooks as the carrier, through the expansion and extension, many of the exam questions have evolved. The title is shown in Figure 1. BC is the diameter of ⊙O, AD⊥BC, and the foot is D.