单项选择题
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
单项选择题 The collision bulkhead shall be of（）.
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.
单项选择题 The canvas covering of fire hose is called the（）.