39undercut50411016.8TR4730.1492.5.2.55.12.55661110.954.1510.90.7520.5530.5540.60.1ERSERS80%~90%1.8551.25.1FIA5656DRS1DRSDRS10.21DRS0.7DRSDRSDRSDRS0.70.08DRSERSDRSDRS1ERSDRSERSERSERSERSDRSERSDRSDRS2DRS50%DRSERSDRST12F11（）