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【简答题】
T形梁截面效率指标应大于(),()能有效的提高截面的效率指标。
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【单选题】如 图,平行板电容器经开关 K与电池连接,a处有一带电量非常小的点电荷。K是闭合的,U a 表示 a点的电势,F表示点电荷受到的电场力。现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
U a 变大, F变大
B.
U a 变大,F变小
C.
U a 不变,F不变
D.
U a 不变,F变小
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【判断题】对于球头铣刀是指球心或球头顶点。( )
A.
正确
B.
错误
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【单选题】Most of his spare time ____spent in reading.
A.
are
B.
were
C.
was
D.
have been
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【简答题】However, Audrey never allowed her sorrow to conquer her or to spoil her hope for a better future.
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【单选题】如图所示,平行板电容器经开关S与电池连接,a处有一电荷量非常小的点电荷,S是闭合的,φa表示a点的电势,F表示点电荷受到的电场力.现将电容器的B板向下稍微移动,使两板间的距离增大,则【图片】
A.
φa 变大, F 变大
B.
φa 变大, F 变小
C.
φa 不变, F 不变
D.
φa 不变, F 变小
查看完整题目与答案
【单选题】如图9-4-12所示,平行板电容器经开关S与电池连接,a处有一电荷量非常小的点电荷,S是闭合的,φ a 表示a点的电势,F表示点电荷受到的电场力.现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
φ a 变大,F变大
B.
φ a 变大,F变小
C.
φ a 不变,F不变
D.
φ a 不变
查看完整题目与答案
【单选题】—I often see him working hard in his spare time. —________he has won the scholarship from time to time.
A.
No wonder
B.
No doubt
C.
No way
D.
No problem
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【单选题】顺序图和协作图主要用于()的建模,用它们来描述用例图的实现
A.
数据流
B.
控制流
C.
消息流
D.
数据字典
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【简答题】Most of his spare time ____spent in reading.A. are B. were C. was D. have been
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【单选题】I am very worried because my son ________ most of his spare time ________ playing games on the computer.
A.
concentrates;on
B.
concentrates;in
C.
focuses;to
D.
focuses;in
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相关题目:
【单选题】如 图,平行板电容器经开关 K与电池连接,a处有一带电量非常小的点电荷。K是闭合的,U a 表示 a点的电势,F表示点电荷受到的电场力。现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
U a 变大, F变大
B.
U a 变大,F变小
C.
U a 不变,F不变
D.
U a 不变,F变小
查看完整题目与答案
【判断题】对于球头铣刀是指球心或球头顶点。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Most of his spare time ____spent in reading.
A.
are
B.
were
C.
was
D.
have been
查看完整题目与答案
【简答题】However, Audrey never allowed her sorrow to conquer her or to spoil her hope for a better future.
查看完整题目与答案
【单选题】如图所示,平行板电容器经开关S与电池连接,a处有一电荷量非常小的点电荷,S是闭合的,φa表示a点的电势,F表示点电荷受到的电场力.现将电容器的B板向下稍微移动,使两板间的距离增大,则【图片】
A.
φa 变大, F 变大
B.
φa 变大, F 变小
C.
φa 不变, F 不变
D.
φa 不变, F 变小
查看完整题目与答案
【单选题】如图9-4-12所示,平行板电容器经开关S与电池连接,a处有一电荷量非常小的点电荷,S是闭合的,φ a 表示a点的电势,F表示点电荷受到的电场力.现将电容器的B板向下稍微移动,使两板间的距离增大,则( )
A.
φ a 变大,F变大
B.
φ a 变大,F变小
C.
φ a 不变,F不变
D.
φ a 不变
查看完整题目与答案
【单选题】—I often see him working hard in his spare time. —________he has won the scholarship from time to time.
A.
No wonder
B.
No doubt
C.
No way
D.
No problem
查看完整题目与答案
【单选题】顺序图和协作图主要用于()的建模,用它们来描述用例图的实现
A.
数据流
B.
控制流
C.
消息流
D.
数据字典
查看完整题目与答案
【简答题】Most of his spare time ____spent in reading.A. are B. were C. was D. have been
查看完整题目与答案
【单选题】I am very worried because my son ________ most of his spare time ________ playing games on the computer.
A.
concentrates;on
B.
concentrates;in
C.
focuses;to
D.
focuses;in
查看完整题目与答案