在使用期限内，由于长期的荷载作用或突然的灾害，混凝土结构会出现安全隐患，严重的会危及人的生命财产安全。
Because of the long-term action of load or abrupt disaster under the term of usage, the concrete structure will appear the safety problem and endanger the property and the security of people's life.
基于“安全期限理论”，提出了直升机使用期限消耗量的计算方法，并进行了实例的可靠性分析。
Based on the security time limit theory, the calculation method for the consumption amount of the appointed time and some examples of reliability analysis were presented.
路面平整度直接影响车辆行驶的舒适度及路面的安全性和使用期限。
The roughness of road surface is direct reflection of the comfort of the travel vehicle, the road security and the road use life.
路面平整度直接影响车辆行驶的舒适度及路面的安全性和使用期限。
The roughness of road surface is direct reflection of the comfort of the travel vehicle, the road security and the road use life.
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