A. 构造物一般应按基本烈度采取抗震措施
B. 一级公路上的抗震重点工程，可比基本烈度提高1度采取抗震措施
C. 基本烈度为9度的地区，其抗震措施应专门研究
D. 四级公路上的一般工程其抗震措施可比基本烈度降低1度采取抗震措施
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