Ƙimar juriyar wuta na ƙofofin wuta na ƙarfe ya kasu kashi uku. Lokacin juriya na wuta na Class A kofofin wuta na ƙarfe ba zai zama ƙasa da sa’o’i 1.5 ba; lokacin juriya na wuta na Class B ƙofofin wuta na ƙarfe ba zai zama ƙasa da sa’o’i 1.0 ba; lokacin juriyar wuta na Class C karfe kofofin wuta ba zai zama ƙasa da sa’o’i 0.5 ba.

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