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【单选题】
是20世纪50年代中期由美国市场营销学家温德尔·斯密首先提出的一个概念。A.
市场细分
B.
市场定位
C.
市场选择
D.
市场策略
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反馈参考答案：
举一反三
【单选题】UMS are mainly unattended overnight and during this time the ________ should have control of the main engine.
A.
chief engineer
B.
engineer on cabin watch
C.
bridge officer on watch
D.
master
【简答题】一个理想光学系统的三种放大率(垂轴放大率β、轴向放大率α与角放大率γ)三者之间的关系为 ( ) 。
【单选题】UMS are mainly unattended overnight and during this time ____ should have control of the main engine
A.
the chief engineer
B.
the engineer on cabin watch
C.
the bridge officer on watch
D.
the master
【单选题】UMS are mainly unattended overnight and during this time main engine should have control of the ________
A.
the chief engineer
B.
the engineer on cabin watch
C.
the bridge officer on watch
D.
the master
【简答题】按磁路的结构形式不同，点火线圈可分为开磁路点火线圈和闭磁路点火线圈两种。目前在独立电子点火系统中应用最广泛的是（）。
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