单项选择题

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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The collision bulkhead shall be of（）.

A.water-tight
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C.fire-tight
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The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire，（）the claimant proves that the fire arose from fault or neglect on the part of the carrier，his servants or agents.

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The canvas covering of fire hose is called the（）.

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The disadvantage of using CO2 is that the（）.

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The disadvantage of using CO₂ is that the（）.