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【多选题】
下列对于安全生产许可证的说法正确的有()。A.
安全生产许可证有效期为五年。
B.
未取得安全生产许可证的企业不得从事建筑施工活动。
C.
建设主管部门在颁发施工许可证时必须审查安全生产许可证。
D.
未发生死亡事故的许可证有效期届满时自动延期。
E.
发生死亡事故的许可证有效期届满时，办证机关同意可延期。
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