gate system短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 浇注系统 Different site microstructure and mechanical properties of aluminum- silicon alloy in differential pressure casting process were investigated. The gate system was adopted vertical slitting gate system. 采用差压铸造工艺，研究垂直缝隙式浇注系统浇注的铝合金硅铸件不同位置的组织和力学性能变化。 cnki