單項選擇題

Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.

A.when the remaining charge volume is less than 90 percent of the required VOLUME
B.at each inspection for certification
C.at each annual inspection
D.when the weight loss exceeds 10% of weight of charge

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單項選擇題

The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.

A.welding brackets across both ends of the crack
B.chipping out and slot welding the entire crack
C.drilling a hole at each end of the crack
D.cutting a square notch at each end of the crack

單項選擇題

The fire extinguishing action of CO₂ comes mostly from （）.

A.breaking the fire chemical chain reaction
B.smothering
C.cooling
D.isolating the heat from the fuel

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Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.

你可能感興趣的試題

The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.

The fire extinguishing action of CO2 comes mostly from （）.

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The fire extinguishing action of CO₂ comes mostly from （）.