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260 ^11108 Hltr-sf=sl 6! I9]_dEI1I I 1. dTlFg €--& eE6Lq "J= +g_tr tiE B=*ol 0.02-0.05o/ooJ Egt 2.7 : 3+59 EBi.l4 6lHg 4 +4+= ttgZ 3. a+E r+nl ? ?C"l 7l* = r+nl=? 4. Cu-4,SPEL?el o}$f olrl +El+= 2.4!? 5. Ala+E ?la =zls-tr +EI+= €^Jg? 6. siaFg BZI EE.J 6IHg 4 +4.flE =4g? 7. Hl+ol Feql Hl6lq L?AE TIEI, gdol 660cql^] Ec.J*4zlE 4= ++g? s. f,arg =Hi]4 6199 "ll zlzl4l zI^J v*ol +El+= trSz e. Al-siE}=el t4s=t to. f MgEti9 trl^ll =zl9 BEI=? tI. Mg-Zn-Zr-REAI(qBZZA)Et+ql^-l MgZrE]dJEg qL *ql E-q glEzl.? 12. Mg-Al-Zn 6J79 +=a1Hg ,I +4+= =zlg? 13. Zn-t.SMg Et+ql^] F=Al ,uolE t9 aJ+ gA=? 14. Zn-3MgEL?qld +4+= =zlel € r]l=Z 15. afl Ti'J+ql 4zl9= + gi=? 16. Ti -Al-Sn -J+ql 4Lg oJrJol_tr- +4+E =zlg? 17. =^| aB Ti Et+ql^l zrt "tI ol99 rzlel €Etl=? 18. Pb+l0Sn gt7q1,r] +4+= =zlel €EI=? le. pb-sn B*el^l pbE *ol ?na1a Sn9 *ol ?zl* "I qE Brle. Bol=z|? 20. AuB?9 18K= Au9 CBol H o/o g'+€ 7)oJ7l? 21. Au-Ni-Cu-Zn* ? ztt Et"g? 22. iAuq ul,r.flf zlofl,r-l E + gl= =4E BEI.? 23. Au_Ni Er+q ^JflEql^J *g gEql^l +EI+= r+nlE BEl.? 2a. iAs{ a!E €4=?