A.關掉相應側的CP電源,換好后再上電,解閉RP,修復CP B.閉塞相應RP,換板,解開RP C.閉塞相應RP,SARPI,換好后解開RP,SARPE D.分離相應RP和相應側的CP,換好后解開RP,修復CP