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一单芯同轴电缆的构造是中间为半径R1的金属导线，其外包着两层同轴圆筒状均匀电介质，两层电介质分界面的半径为R，内外两层电介质的相对介电系数为εr1，和εr2且εr1=2εr2。最外面是同轴金属圆柱筒，筒的内半径为R2，且R2<2R1，如图所示。假设两种电介质的击穿场强均为Eb，试求： (1)当电压升高时，哪层电介质先被击穿； (2)此电缆承受的最大电压； (3)此电缆单位长度的电容C。
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【单选题】周期矩形脉冲序列的频谱的谱线包络线为( )
A.
函数
B.
Sa 函数
C.
函数
D.
无法给出
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【单选题】周期矩形脉冲序列的频谱的谱线包络线为()
A.
冲激函数
B.
Sa函数
C.
阶跃函数
D.
无法确定
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【单选题】The number of people present _______ sixty, but a larger number of people_______ coming here to get tickets for free. [     ]
A.
is; are
B.
is; is
C.
are; are
D.
are; is
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A.
正确
B.
错误
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A.
是
B.
否
C.
是 但做的不好
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【单选题】How many people are _____________ to the party? [     ]
A.
come
B.
comes
C.
coming
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【单选题】To tell ____ truth, his coming is really ____ big surprise to most people present at the party.
A.
/ ; a
B.
the; /
C.
the; a
D.
/ ; /
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【单选题】The number of people at present _____ sixty, but a number of people _____ coming here to get tickets for free. [     ]
A.
is; is
B.
is; are
C.
are; are
D.
are; is
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【单选题】Not all the white people coming to register could read.
A.
正确
B.
错误
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【单选题】听力原文：You' ve probably noticed the stains on the ceiling and the strong smell coming from the bathrooms. This is because of the problem we have had with the pipes in this building. Repair people will b...
A.
Electrical
B.
Structural
C.
Garden
D.
Plumbing
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相关题目：
【单选题】周期矩形脉冲序列的频谱的谱线包络线为( )
A.
函数
B.
Sa 函数
C.
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D.
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查看完整题目与答案
【单选题】周期矩形脉冲序列的频谱的谱线包络线为()
A.
冲激函数
B.
Sa函数
C.
阶跃函数
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【单选题】The number of people present _______ sixty, but a larger number of people_______ coming here to get tickets for free. [     ]
A.
is; are
B.
is; is
C.
are; are
D.
are; is
查看完整题目与答案
【判断题】数字地球的基础是影像。
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正确
B.
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【单选题】评估患者仰卧在平坦表面上
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【单选题】How many people are _____________ to the party? [     ]
A.
come
B.
comes
C.
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【单选题】To tell ____ truth, his coming is really ____ big surprise to most people present at the party.
A.
/ ; a
B.
the; /
C.
the; a
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查看完整题目与答案
【单选题】The number of people at present _____ sixty, but a number of people _____ coming here to get tickets for free. [     ]
A.
is; is
B.
is; are
C.
are; are
D.
are; is
查看完整题目与答案
【单选题】Not all the white people coming to register could read.
A.
正确
B.
错误
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【单选题】听力原文：You' ve probably noticed the stains on the ceiling and the strong smell coming from the bathrooms. This is because of the problem we have had with the pipes in this building. Repair people will b...
A.
Electrical
B.
Structural
C.
Garden
D.
Plumbing
查看完整题目与答案
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