Described the actuality and development of the research of the coal ash fusibility.
描述了国内外对煤灰熔融特性研究的现状和进展。
The actuality and development of electronic transformer are introduced, from four types:stereoscopic, plane, chip, film.
从新材料、新结构、新原理、新产品等四个方面介绍了电源中电子变压器的一些新进展。
The actuality and development of automotive cover panel punching process are introduced and the characters and selection method of punching production lines was summarized.
介绍了我国汽车车身覆盖件冲压生产工艺的现状和发展趋势，总结了各类冲压生产线的特点和选择生产线的方法；
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