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

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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

單項選擇題

The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.

A.quantity of fuel to be received
B.flash point of the fuel as it is received
C.fuel temperature as it is received
D.viscosity of the fuel being received

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

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

The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.

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