单选题A portable foam fire extinguisher is placed in operation by（）Aturning it upside downBpressing the foam leverCsqueezing the grip handleDopening the hose valve
单选题
A portable foam fire extinguisher is placed in operation by（）
A
turning it upside down
B
pressing the foam lever
C
squeezing the grip handle
D
opening the hose valve
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