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【单选题】
通常数控机床的坐标系往往通过右手笛卡尔坐标系进行判定,下列说法错误的是()A.
大拇指、食指、中指互为90度
B.
大拇指指向代表z轴正方向
C.
中指指向代表Z轴正方向
D.
只有AC正确
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