有效期的延长 extension of validity

合同有效期的延长 extension of a contract

产品有效期的控制 The product's lifetime control ; Control of Life

投标的有效期 tender validity

长期有效的增塑剂 extended life superplasticizer

保险单的有效期 validity of policy

签证的有效期 Enter before

发盘的有效期 time of validity ; time of validity duration of offer ; Duration of Offer

长期有效的 Standing ; Long-term effective ; Effective long-term ; timeless

长期有效的措施 Long-term and effective measures ; Long-term effective measures