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【多选题】
正确划分爆炸危险区域的级别和范围是电气防爆设计的基本依据之一，下列关于爆炸危险区域划分的说法中，正确的有( )。
A.
固定顶式油管内部油面上方的空间应划为爆炸性气体环境0区
B.
正常运行时偶然释放爆炸性气体的空问可划分为爆炸性气体环境1区
C.
正常运行时偶尔且只能短时问释放爆炸性气体的空间不划为爆炸性气体环境
D.
良好、有效的通风可降低爆炸性环境的危险等级
E.
爆炸性气体密度大于空间密度时，应提高地沟、凹坑内爆炸性环境的危险等级
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