investment casting短语¹⁴⁴⁹⁷²⁺² 基本例句 熔模铸造 The investment casting technique of pressure ring, a key part of dry expansion machine was introduced. This technique can achieve cut less processing, raise working efficiency and reduce cost. 介绍了干法膨化机中关键零件压力环的熔模铸造生产工艺,由此实现了无切削加工,提高了工效,降低了成本。 cnki