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【多选题】
半闭环控制数控机床是用()的方式间接检测运动部件的坐标位置。A.
测量电动
B.
丝杠转角
C.
测量电压
D.
运动速度
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举一反三
【单选题】Besides its main mission, the orbiter would also be used as
A.
a medical research center.
B.
a space station.
C.
a space ambulance.
D.
a passenger plane.
【简答题】车床可加工的8种回转表面是指:(1) 外圆 ;(2) 内孔 ;(3) ___;(4) 端面 ;
(5) _____;(6) 螺纹 ;(7) ___;(8) 滚花 。
【单选题】Which of the following can NOT be inferred from the end of the passage?
A.
Though the research was not scientifically accurate, it pointed to some encouraging results.
B.
There are many factors influencing one's outlook during his/her growing up.
C.
The virtuous die young, but the evil leave a stink for ten thousand years.
D.
The author urges us to become more environmentally-conscious as the society develops.
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