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单选题
When two fire hose teams are attacking a fire they should（）.
A
use different fire hose pressures
B
use fire hoses of different sizes
C
not attack the fire from opposite sides
D
not wear protective clothing
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单选题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.A
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单选题When should a fire be ventilated?（）A
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Underwriter's Laboratories，Inc
考题
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单选题When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.A
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