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【单选题】
万能外圆磨床加工工件表面有( )的原因之一是磨削砂轮修整不良。
A.
螺旋线
B.
划线
C.
划伤
D.
划痕
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【判断题】G81孔加工进给采用间隙式切削进给。 ( )
A.
正确
B.
错误
【简答题】阅读理解。 I started to study English by myself when I was about 15 because of Michael Jackson. He's been my idol since1991, and I really wanted to understand him and his music. 1 I was very patient, and t...
【判断题】碰撞缓冲区的作用是在碰撞时,可以按照设计的方向产生变形,从而吸收碰撞能量,保护其他部位。
A.
正确
B.
错误
【简答题】Now listen to the conversation again and answer the following questions. 1. What has Wang Ying decided to do? 2. What does Li Ming think of her decision? 3. What does he ask her to do? 4. How is Wang ...
【单选题】is the oldest surviving poem in theEnglish language, and is generally regarded as the national epic of the English people.
A.
Ecclesiastical History of the English People
B.
Beowulf
C.
The  Death of Arthur
D.
The Canterbury Tales
【单选题】The author cites Beowulf in order to show that______.
A.
the distance between song and poetry is not so great
B.
a song like Beowulf can sound like a poem
C.
English poetry is highly connected to songs
D.
songs generally evolve into poetry over time
【单选题】在下列()市场中,D=P=AR=MR。
A.
完全竞争市场
B.
完全垄断市场
C.
寡头垄断市场
D.
垄断竞争市场
【单选题】P>MR,不在下列 ( )市场中。
A.
完全竞争市场
B.
完全垄断市场
C.
寡头垄断市场
D.
垄断竞争市场
【多选题】在一个n公司古诺竞争的市场中,市场需求为P=100-Q,每家公司的边际成本均为c=20,下列正确的是?
A.
市场中的总供给量为
B.
若市场中的均衡价格为P=40,市场中应有3家公司
C.
勒纳指数的数值不会大于1
D.
市场中有3家公司时,需求价格弹性为2
【单选题】在完全竞争市场中,下列说法错误的是
A.
单个厂商只能根据市场价格确定产品的价格
B.
单个厂商产品的需求曲线是一条由既定市场价格出发的平行线
C.
对单个厂商来说,有AR=P=MR
D.
单个厂商的TR曲线的斜率会发生变动
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