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【单选题】
下列因素中导致自激振动的是( )。A.
(A)转动着的工件不平
B.
(B)机床传动机构存在问题
C.
(C)切削层沿其厚度方向的硬化不均匀
D.
(D)加工方法引起的振动
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反馈参考答案：
举一反三
【单选题】Where does Semenov’s company sell their products?
A.
All across Europe.
B.
Throughout the world.
C.
Mostly in Bucharest.
D.
In Romania only.
【简答题】用例中的主要关系有___,___和___。
【单选题】Where does so many companies sell their products?
A.
All across europe.
B.
Throughout the world
C.
. Mostly in brush rest.
D.
In romania early.
【简答题】Their products sell well. _________(我们的) do better.
【判断题】Cell phone salespersons not only sell their products but also their personality and professionalism.
A.
正确
B.
错误
【单选题】Where are they going to sell their products?
A.
in their own shops
B.
in snack bars and similar outlets
C.
in bars and restaurants
D.
/
【简答题】用例中的主要关系有包含;扩展;和___。
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