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Introduced built-up welding welding rod's selection principle and built-up welding craft when the Angle steel shearing punch built-up welding.
介绍了角钢剪切凸模堆焊时，堆焊焊条的选择原则及堆焊工艺。
These are best employed from rotary - wing aircraft , but still pack a punch when employed from fixed - wing craft.
最适用于水平螺旋桨飞机，也是固定翼飞机的杀伤利器。
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