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Installed casing side reserved pin hole, accurate.
箱体侧面预留销轴安装孔，安装精确。
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Research on boring mechanism for piston noncircular pin hole;
简述了采用活塞异形销孔的必要性及其结构特点。
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Pin hole bolt ruptures under its service.
销孔螺栓在服役期限内发生断裂。
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Pin hole bolt ruptures under its service.
销孔螺栓在服役期限内发生断裂。
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