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【单选题】
“火区”是由制造厂设计的飞机上的一个区域范围，它要求()。
A.
有火警探测系统
B.
有火警探测系统和灭火系统
C.
有火警探测系统和灭火系统，本身有较高抗燃性
D.
有火警探测系统和灭火系统，本身有较高抗燃性，并在火区内设有报警信号
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