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单选题
The disadvantage of using CO2 is that the（）.
A
CO2 does not cool the fire
B
cylinders are regulated pressure vessels
C
C02 is not effective on class B fires
D
C02 is not effective on class C fires
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evacuate all engine room personnelD
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考题
单选题The disadvantage of using a heaving line to pass a towline is that（）.A
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考题
单选题After using a CO2 extinguisher on a ship，it should be（）.A
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考题
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