数字证书由受信任机构(认证机构或CA)发布，并且限制了使用期限。
A digital certificate is issued by a trusted authority (a certificate authority or ca) and is issued only for a limited time.
未于更新期限以前提交完整更新申请的认证课程将于期限后失效。
Programs that do not submit a complete renewal application by the renewal deadline will no longer be ICF accredited programs.
若超过期限没有认证，社保管理系统将默认自动停发养老金。
If the ID is not certified before deadline, social security management system will automatically suspend the pension.
埃德芒果，NASA商业载人计划项目经理，在这次会议上表示，关于DDTE /认证条款的基本期限计划为从2014年7月至2017年9月31日。
EdMango, program manager of NASA's commercial crew program, indicated at theconference that the base period for the DDTE/Certification item is planned tobe from July 2014 to September 31,2017.
ISSA课程是以自学为主的认证课程，所有的课程都是根据教练个人的学习能力来自行调整学习的期限。
ISSA courses are offered through both independent study and weekend seminars. All courses are self-paced, allowing for individual differences in learning abilities.
ISSA课程是以自学为主的认证课程，所有的课程都是根据教练个人的学习能力来自行调整学习的期限。
ISSA courses are offered through both independent study and weekend seminars. All courses are self-paced, allowing for individual differences in learning abilities.
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