实现了操作自由，有效解决大直径的钻孔问题并解决了大型工件加工范围大的困难。
Free operation is realized, thus effectively solving a problem of the bore that the diameter is big and a difficulty of a large workpiece that the work range is large.
实现了操作自由，有效解决大直径的钻孔问题并解决了大型工件加工范围大的困难。
Free operation is realized, thus effectively solving a problem of the bore that the diameter is big and a difficulty of a large workpiece that the work range is large.
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