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【单选题】
船舶发生火灾在应急阶段时,释放灭火剂后至少要封舱________小时,开舱前必须派探火,确认火已经被扑灭。A.
12.0
B.
24.0
C.
48.0
D.
72.0
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A.
If so
B.
If not
C.
If any
D.
If anything
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