When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）. A:first to the bottom of the flaming area，sweeping from side to side，and following the flames upward B:in a circular motion from the middle of the bulkhead outward C:to the top of the flaming area，sweeping from side to side，and working toward the bottom D:in an up-and-down motion from one side of the bulkhead to the other

When using carbon dioxide to fight a fire on a bulkhead，the CO₂ should be applied（）.
A:first to the bottom of the flaming area，sweeping from side to side，and following the flames upward
B:in a circular motion from the middle of the bulkhead outward
C:to the top of the flaming area，sweeping from side to side，and working toward the bottom
D:in an up-and-down motion from one side of the bulkhead to the other

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