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【简答题】

试证明：
Rn中开球B(x0，r)的闭包是闭球C(x0，r):
．

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题目标签：闭球闭包开球
参考答案：
参考解析：
.
刷刷题刷刷变学霸
举一反三

【单选题】扣拉开球的助跑路线为
A.
直线助跑
B.
外绕助跑
C.
斜线助跑
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【单选题】(2007年)设真空中点电荷+q 1 和点电荷+q 2 相距2a，且q 2 =2q 1 ，以+q 1 为中心、a为半径形成封闭球面，则通过该球面的电通量为( )。
A.
3q 1
B.
2q 1
C.
q 1
D.
0
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【单选题】求左序空间中的闭包:
A.
(-∞,0)
B.
A
C.
[0,+∞)
D.
(0,+∞)
E.
(-∞,0]
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【简答题】潘钟祥教授划分圈闭的三大类中，水动力圈闭包括哪些亚类？
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【判断题】中圈开球时，将球直接踢进对方球门，裁判员判进球有效。
A.
正确
B.
错误
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【简答题】The University Bookstore is a serf-supporting university-owned organization, which was founded in 1921. It provides students, faculty, staff, and campus visitors with a variety of products and service...
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【判断题】开球可以直接射门得分。
A.
正确
B.
错误
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【简答题】The University Bookstore is a self-supporting university-owned organization, which was founded in 1921. It provides students, faculty, staff, and campus visitors with a variety of products and service...
查看完整题目与答案

【简答题】The University Bookstore is a self-supporting university-owned organization, which was founded in 1921. It provides students, faculty, staff and campus visitors with a variety of products and services...
查看完整题目与答案