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【单选题】
dgx021303 诺顿定理指出,对外部电路而言,任何一个有源二端网络都可以等效为 ( ) 。A.
理想电压源与电阻的串联
B.
理想电流源与电阻的串联
C.
理想电压源与电阻的并联
D.
理想电流源与电阻的并联
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举一反三
【单选题】下列运算正确的是 [ ]
A.
a 2 +a 2 =2a 4
B.
a 2 a 4 =2a 8
C.
（﹣3a 2 b 3 ） 2 =6a 4 b 6
D.
a 6 ÷a 3 =a 3 （a≠0）
【单选题】根据套利者对相关合约中价格较高的一边的买卖方向不同，期货价差套利可分为（ ）。
A.
正向套利和反向套利
B.
牛市套利和熊市套利
C.
买入套利和卖出套利
D.
价差套利和期限套利
【单选题】Surprisingly, Susan’s beautiful hair reached below her knees and made _____ almost an overcoat for her.
A.
them
B.
her
C.
itself
D.
herself
【简答题】完形填空。 The passengers on the bus watched with sympathy as Susan made her way carefully up the steps. She paid the driver and then, using her hands to 1 the seats, settled in one of them. It had been a ...
【简答题】完形填空。 The passengers on the bus watched with sympathy as Susan made her way carefully up the steps. She paid the driver and then, using her hands to__1__the seats, settled in one of them. It had been ...
【单选题】Surprisingly，Susan's beautiful hair reached below her knees and made ________ almost an overcoat for her.(2011·安徽)
A.
them
B.
her
C.
itself
D.
herself
【简答题】完形填空 The passengers on the bus watched with sympathy as Susan made her way carefully，up the steps. She paid the driver and then, using her hands to 1 the seats，settled in one of them. It had been a ye...
【简答题】计算：（2a 3 b 2 ﹣4a 4 b 3 +6a 5 b 4 ）÷（﹣2a 3 b 2 ）．
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