83 ICE28 concerned w ith the copper T
2 in electriccal engineering. (R eceived on A ug. 22, 1997)
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1998 年(总第
61 期) 张文亮等: 球铁实用冒口及浇口的设计计算 ? 1995-2004 Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved. ........