如图,四边形ABCD内接于⊙O,AB为⊙O的直径,过点C作CE⊥AD交AD的延长线于点E,延长EC,AB交于点F,∠ECD=∠BCF.(1)求证:CE为⊙O的切

如图,四边形ABCD内接于⊙O,AB为⊙O的直径,过点C作CE⊥AD交AD的延长线于点E,延长EC,AB交于点F,∠ECD=∠BCF.(1)求证:CE为⊙O的切线;(2)若DE=1,CD=3,求⊙O的

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Train services are now back to______after three days of typhoon.

Train services are now back to______after three days of typhoon.

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The song ____My heart will go on is liked by the young people.

The song ____My heart will go on is liked by the young people.

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He likes ______ in summer. ( )

He likes ______ in summer. ( )

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The red rose is the only one_____I real like.

The red rose is the only one_____I real like.

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