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为遵循可比性会计信息质量要求，企业一旦确定采用某会计政策，以后期间不能变更此会计政策。（） $amp;;$br＞

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An antivirus program(1)a virus by searching code recognized as that of one of the thousands of viruses known to afflict computer systems. An antivirus program also can be used to create a checksum for(2)files on your disk, save the checksums in a special file, and then use the statistic to(3)whether the files are modified by some new virus. Terminate and stay resident (TSR) programs can check for unusual(4)to access vital disk areas and system files, and check files you copy into memory to be sure they are not(5).

在下列选项中，正确地产生文本区（textarea)的标记是（)。

在H FML文档中用于表示表格的标记对是（)。

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37.51 37.56 39.78 40.27 38.26 38.79求产量方差σ²的置信区间．(α=0.05)