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TBTB 1424821982062419821201(1.1.1.40404040401.2. ()11A6075E7590B85100F110125H1351501.3. 8881.4.1.5. 23 (12P3P12P30P60P120P300P600P1200P2000P300031230601203006001200200030003TD1OTD15TDZ5TD40TD6010%15%25%40%60%1.6. 44354568m8068m60805060808055601525()1.7. 55AEBFH60758010012560758010012540551.8. 6665705511A1.9.2.2.1.1132.2. 20%32.3.3)(12m32.4.t = R2 R1R1tR1R2t2(k + t1 ) (t2 t1 )K234.5245R22.5.(t3)2.4Kt22.42.6.2.7.15%k + t 3k + t 2k + t 2k + t 32.8.2.9.2.10.2.11.2.12.5