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【判断题】
脉冲当量越小,数控机床的加工精度和加工表面质量越低。A.
正确
B.
错误
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【简答题】在真空中O点放一个试探电荷 ,直线MN通过O点,OM的距离r=30cm,M点放一个试探电荷 ,如图所示.求: ( 1 ) q 在 M 点受到的作用力; ( 2 ) M 点的场强; ( 3 )拿走 q 后 M 点的场强; (4) M 、 N 两点的场强哪点大? ( 5 )如果把 Q 换成电荷量为 -1.0×10 -9 C 的点电荷,情况又如何?
【单选题】听力原文： The United States has strongly criticized the broadcast of previously unseen images of alleged prisoner abuse at Abu Ghraib Prison in Iraq. The images, which show prisoners apparently being tort...
A.
It has denied the authenticity of the pictures of abused prisoners.
B.
It has supported the decision to stop the publication of the pictures.
C.
It has considered the pictures of abused prisoners unacceptable.
D.
It has been worrying about the violence incited by the pictures.
【简答题】把q 1 =4×10 -9 C的试探电荷放在电场中的A点,具有6×10 -8 J的电势能,求A点的电势.若把q 2 =2×10 -10 C的试探电荷放在电场中的A点,电荷具有的电势能是多少?
【简答题】测定宏观应力的方法很多,利用应力敏感性的方法,如超声、磁性、X射线衍射等,这种方法是 。
【简答题】Kerry Blasts Bush Iraq “mistake” 1. Democrat presidential hopeful John Kerry has accused President Bush of failing to do enough to get the world support needed to win peace in Iraq. 2. In a weekly rad...
【单选题】听力原文： The United States has strongly criticized the broadcast of previously unseen images of alleged prisoner abuse at Abu Ghraib Prison in Iraq. The images, which show prisoners apparently being tort...
A.
It has denied the authenticity of the pictures of abused prisoners.
B.
It has supported the decision to stop the publication of the pictures.
C.
It has considered the pictures of abused prisoners unacceptable.
D.
It has been worrying about the violence incited by the pictures.
相关题目：
【简答题】把q 1 =4×10 -9 C的试探电荷放在电场中的A点,具有6×10 -8 J的电势能,求A点的电势.若把q 2 =2×10 -10 C的试探电荷放在电场中的A点,电荷具有的电势能是多少?