单项选择题
The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.
A.shield fire fighters from radiant heat B.break up burning material C.get the most water possible on the fire D.drive heat and smoke ahead of the fire fighters
单项选择题 The sprinkler system of a survival craft is used to（）.
单项选择题 The spread of fire is prevented by（）.
单项选择题 The spread of fire is NOT prevented by（）.
