单项选择题

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

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