A portable foam fire extinguisher is placed in operation by（）<br>A:turning it upside down<br>B:pressing the foam lever<br>C:squeezing the grip handle<br>D:opening the hose valve

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

出自：海船船员证

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