The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.<br>A:welding brackets across both ends of the crack<br>B:chipping out and slot welding the entire crack<br>C:drilling a hole at each end of the crack<br>D:cutting a square notch at each end of the crack

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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