單項選擇題

A portable dry chemical fire extinguisher discharges by（）.

A.gravity when the extinguisher is turned upside down
B.pressure from a small CO₂ cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical

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單項選擇題

A passenger vessel is required to have a supervised patrol when（）.

A.there are passengers berthed on board
B.navigating in excess of eight hours
C.the vessel has substantial wood in its construction
D.there is no automatic fire-detection system installed

單項選擇題

A marine chemist issues gas free certificates and is certified by the（）.

A.Mine Safety Appliance Association
B.American Chemical Society
C.Marine Chemists Association
D.National Fire Protection Association

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A portable dry chemical fire extinguisher discharges by（）.

你可能感興趣的試題

A passenger vessel is required to have a supervised patrol when（）.

A marine chemist issues gas free certificates and is certified by the（）.

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