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Air defense scheme and the plan of their implementation shall be revised at least once every 5 years.
防空袭方案及其实施计划至少每五年修订一次。
youdao
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Air defense scheme and the plan of their implementation shall be revised at least once every 5 years.
防空袭方案及其实施计划至少每五年修订一次。
youdao