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【简答题】
数控机床按伺服系统的形式分类,可分为:开环控制、 、 。
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Real competition can happen only when ______.
A.
academic standard is improved
B.
there are comparable schools with different educational qualities
C.
students have different interests
D.
schools of all areas have sufficient budget for their development
【单选题】Michael put me in a ______ position when we talked about the matter that day.
A.
real difficulty
B.
really difficulty
C.
really difficult
D.
real and difficult
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