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【多选题】
下列有关气体灭火系统中防护区的划分说法正确的是( )。
A.
防护区应根据封闭空间的结构特点和位置来划分
B.
采用管网灭火系统时，一个防护区的面积不宜大于500m2，且容积不宜大于1600m3
C.
防护区宜以单个封闭空间划分
D.
同一区间的吊顶层和地板下需同时保护时，可合用一个防护区
E.
采用预制灭火系统时，一个防护区的面积不宜大于800m2，且容积不宜大于3600m3
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