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by doing interviews of students and teachers. In order to improve the efficiency of teachers in terms of English classroom discourse and create a favorable learning environment, the comparative study on the classroom discourse of the quality and quantity characteristics is very necessary to conduct.
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and
(f) Sn-40Bi-0.5Ag.
(a)
(b)
(c)
(d)
(e)
(f)
Fig. 18. Comparison of elongation;
(a) Sn-40Bi-0.1Mn, (b) Sn-40Bi-0.2Mn,
(c) Sn-40Bi-0.1In, (d) Sn-40Bi-0.2In,
(e) Sn-40Bi-0.25Ag, and (f) Sn-40Bi-0.5Ag.
5. 참고문헌
1. J. M. Yoon : Mechanical properties of Sn-Bi-Ag Lead-free Solder, Department of M
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