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【简答题】
Japan is said to be ____in the earthquake zone. (location)
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皮皮学刷刷变学霸
举一反三
【单选题】有关数控机床坐标系的说法,其中()是错误的。
A.
刀具相对静止的工件而运动的原则
B.
标准的坐标系是一个右手直角笛卡尔坐标系
C.
主轴旋转的顺时针方向是按右旋螺纹进入工件的方向
D.
Z轴的正方向是使工件远离刀具的方向
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