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第四章第9讲T-FLEX CAD的装配设计3-水阀的装配零件绘制
第四章第9讲T-FLEX CAD的装配设计3-水阀的装配零件绘制（2手柄盖、3螺栓球、4法兰座、7环密封圈）
T-FLEX CAD入门教程144/249
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