已经发布实施的现有标准（包括已确认或修改补充的标准），经过实施一定时期后，对其内容再次审查，以确保其有效性、先进性和适用性，其周期一般不超过（ ）年。
- A.1
- B.3
- C.5
- D.7
正确答案及解析
正确答案
解析
已经实现了标准化的事物，实施一段时间后，往往由于运动和变化，有可能突破原先的规定，有新的需求，使某些环节的标准失去意义，需要对其内容再次审查，以确保其有效性、先进性和适用性。自标准实施之日起，至标准复审重新确认、修订或废止的时间，称为标准的有效期(也称为标龄)。由于各国情况不同，标准有效期也不同。例如， ISO标准每5年复审一次，平均标龄为4.92年；1988年发布的《中华人民共和国标准化法实施条例》中规定，标准实施后的复审周期一般不超过5年，即我国国家标准有效期一般为5年。
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