The duration of an offer shall not be less than 30 days and shall not be more than 60 days. 收购要约的期限不得少于三十日,并不得超过六十日。
Study on duration of structural deformation can offer important information on restriction conditions to correlative geological events. 构造形成时限的研究,可以为相关地质事件提供重要的制约条件。