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1CiuCCUCRLR0u2CBRCEuCiBEuBiiUCRLR0UCEBRBbIbIberbeLbeLCurRr//RRA较小）(//beBiiirRIUr)(较大CoRrCCU1BR2BRCRERLRiU0UEC1BR2BRCRLRiU0UberbIbIcIiICobeBiiibeLCiouRIUrrRIUrr//RRUUA//CCU1BR2BRCRERLRiU0U1BR2BRCRLRiU0UberbIbIcIiIEREbeLCiouRrRRUUA)1()//(])1(//[//21EbeBBiRrRRrCoRrCCUBRERLRiUSRSE＋－oUBRLRiU0UberbIbIcIiIERSERSeI+—)//)(1()//)(1(LEbeLEuRRrRRA)//)(1(//LEbeBiRRrRr]1)//(//[BSbeEoRRrRr21uuuAAAER+－SESR+1CRB1RB2RC1+EC+2CLRbeLCur//RRACCULRBRRC2+3C21rRiL后级的ri等效为前级的RLCCUERLRBR+－SESR+1CRB1RB2RC1+EC+2CRC2+3C1BR2BR1CR2iriU01U1ber1bI1bI1cIiI+－SR+－SE+－CCULRBR+2CRC2+3C+－SESR前级的ro等效为后级的RS+ER+－SESR+1CRB1RB2RC1ECRS=ro1CCUERLRBR+－SESR+1CRB1RB2RC1+EC+2CRC2+3CBR2CRLR1oU0U2ber2bI2bI2cI1oI+－1or+－1SE+－//121111beiCiourrRUUA//2112beBooirRIUr1BR2BR1CR2iriU01U1ber1bI1bI1cIiI+－SR+－SE+－BR2CRLR1oU0U2ber2bI2bI2cI1oI+－1or+－1SE+－22212//beLCoourRRUUA21uuuAAA1BR2BR1CR2iriU01U1ber1bI1bI1cIiI+－SR+－SE+－BR2CRLR1oU0U2ber2bI2bI2cI1oI+－1or+－1SE+－2121////CobeBBiiiRrrRRIUr1BR2BR1CR2iriU01U1ber1bI1bI1cIiI+－SR+－SE+－BR2CRLR1oU0U2ber2bI2bI2cI1oI+－1or+－1SE+－