the approval shall specify a time limit not exceeding three years the enterprises involved may with justification file a written application for an extension thereof with the central competent authority within three months prior to the expiration of such period
核准时应订定不超过三年的期限，有关企业如有正当理由，得于期限届满前三个月内，向中央主管机关书面申请延长期限
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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