如图，⊙O中，弦CD⊥弦AB于E，若∠B=60°，则∠A=

如图，⊙O中，弦CD⊥弦AB于E，若∠B=60°，则∠A= （）

A． 30° B． 45° C． 60° D． 90°

（第6题）

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如图，⊙O中，弦CD⊥弦AB于E，若∠B=60°，则∠A=

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