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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单项选择题

The collision bulkhead shall be of（）.

A.water-tight
B.air-tight
C.fire-tight
D.oil-tight

单项选择题

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.

A.should
B.shall
C.that
D.if

The disadvantage of using CO2 is that the（）.

The disadvantage of using CO₂ is that the（）.