:20010522:(1979),,1996FYT(041000)A1,FYT1,,,,,,,,FYT,,,,,,,,2211,2:(1),FYT,24FYT,;(2),2FYT,212(1)2131(1),,25cm12cm,,,,,15%,5cm,25mm,015cm,20cm(2),1,,66RAILWAYCONSTRUCTIONTECHNOLOGY2001()©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,20cm,2m,10mm1234214(1),,,1520cm(2),215(1),,,5,5(2),(3),,(4),,,,,3A137,,,,,(65):(1),(2),12,2(1m3)(3),,,2,(4),(5),,(6)()(7)6(1),,,,,;,,,,;,,;,,,,(2),,440,,,,,,,,70%(3)100,,1..:,199876RAILWAYCONSTRUCTIONTECHNOLOGY2001()©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.