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数控机床按数控系统功能水平分类分为高档、中档、低档三类
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国标中规定数控机床的坐标系采用标准右手笛卡尔直角坐标系
工件坐标系又称为加工坐标系，它坐标轴的意义可以与机床坐标轴不同
数控机床某一部件运动的正方向，是增大工件和刀具之间距离的方向。
According to the survey of Stanford University, how do Internet addicted persons use computers?They spent too many weary(疲倦的) hours in (1) _____ ____, emailing, and (2) ________, ultimately taking valuable time away from things like (3) _________, (4) _________ even（5）_________. They are choosing to be on the Internet versus kind friends, versus interacting with somebody, versus having（6）__________.
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