单选题If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（）Aburner valveBroot valveCquick closing valveDoil return valve
单选题
If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（）
A
burner valve
B
root valve
C
quick closing valve
D
oil return valve
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