Report - 2級 鋳造科 指導書...278 (JIS Z 2203) ± 1.0 ± 1.0 ± 2.0 mm 300 350 500 650 200 300 450 600 13 30 45 JIS 50 +1.5mm 28.5mm¿ 31. 8WL Tt 28. 58 8WL r "31. 58 31256 8WL 23149

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