题目内容

平稳AR模型的自相关系数具有两个显著的性质，分别是

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A ___ is a serious play for the theatre, television,or radio.

A. entertainment
B. drama
C. music
D. instrument

A ___ in something such as a theory or argument is a mistake in it, which causes it to be less effective or valid.

A. trick
B. drama
C. flaw
D. advantage

What a ___ that he should have known your family.

A. coincident
B. coincidence
C. fortunate
D. unfortunate

If you ___ of an action, event, or suggestion, you like it or are pleased about it.

A. deny
B. approve
C. prove
D. refuse