A. 基坑支护设计使用期限，即从基坑土方开挖之日起至基坑完成使用功能结束，不应小于一年
B. 基坑支护结构设计必须同时满足承载力极限状态和正常使用极限状态
C. 同样的地质条件下，基坑支护结构的安全等级主要取决于基坑开挖的深度
D. 支护结构的安全等级对设计时支护结构的重要性系数和各种稳定性安全系数的取值有影响
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