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【单选题】
根据数控加工的特点并综合数控加工的经济效益,数控机床通常比较适宜加工具有以下特点的零件: 1)多品种,( )生产的零件或新产品试制的零件; 2)轮廓形状复杂,对加工精度要求较高的零件; 3)用普通机床加工时,需要有昂贵的工艺装备(工具、夹具和模具)的零件; 4)需要多次改型的零件; 5)价格昂贵,加工中不允许报废的关键零件; 6)需要最短生产周期的急需零件A.
大批量
B.
小批量
C.
中批量
D.
都可以
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【单选题】Which one of the following sentences include sensory details?
A.
The car screeched to a halt.
B.
The car suddenly stopped.
C.
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D.
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A.
If the market yield increases by 1% the bond's price will decrease by $60.
B.
If the market yield increases by 1% the bond's price will increase by $50.
C.
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D.
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E.
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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