Which of the listed devices could be used as a substitute for a ring grooving tool?（）<br>A:Steel brush<br>B:Fine emery cloth or steel wool<br>C:A section of the removed compression ring<br>D:A case hardened scraper

Which of the listed devices could be used as a substitute for a ring grooving tool?（）
A:Steel brush
B:Fine emery cloth or steel wool
C:A section of the removed compression ring
D:A case hardened scraper

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