Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.<br>A:outside<br>B:on class C fires<br>C:in an emergency<br>D:on class B fires

Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.
A:outside
B:on class C fires
C:in an emergency
D:on class B fires

出自：海船船员证

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