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【单选题】
数控技术是利用( )化信息技术对机械运动及加工过程进行控制的一种技术。A.
模拟
B.
数字
C.
格式
D.
算法
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举一反三
【简答题】The secret of s successful school __________ effective co-operation between professional leadship, the goverment and the local authority.A. lie down B. lie on C. lie to D. lie in
【单选题】The secret of a successful school consists in effective co-operation between professional leadership, the government and the local authority.
A.
lies down
B.
lies with
C.
lies in
D.
lies ahead
【简答题】制备聚乙烯醇的单体是什么?为什么?请写出制备聚乙烯醇工艺流程及各化学反应方程式。
【单选题】The successful operation of any engine or machine and ____ depend on effective lubrication.
A.
their no trouble period
B.
their freely trouble period
C.
its free trouble life
D.
its trouble-free life
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