根据下列材料请回答题:Why should anti-vires software be updated at leas

根据下列材料请回答题:Why should anti-vires software be updated at least once a week?

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According to the passage,which of the following is NOT used

According to the passage,which of the following is NOT used in heath spas?

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定性评估方法有(  )。

定性评估方法有(  )。 A.上门调查 B.问卷调查 C.访谈 D.观察 E.座谈

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