For mature timber stands, the approaches of selection cutting, clear cutting and shelterwood cutting.
成熟的用材林应当根据不同情况，分别采取择伐、皆伐和渐伐方式。
The machine time for turning depends on the selection cutting parameters that affect the cost of turning, so a study of machine time for turning is necessary.
车削加工机动时间主要取决于切削用量的选择，切削用量的选择直接影响车削加工成本，因而，对车削加工机动时间的研究非常必要。
Mainly includes the blank choice, machine tool selection, cutting dosages and the way to determine the content.
主要包含了毛坯的选择、机床的选择、切削用量的确定等内容。
Mainly includes the blank choice, machine tool selection, cutting dosages and the way to determine the content.
主要包含了毛坯的选择、机床的选择、切削用量的确定等内容。
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