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【简答题】
求级数 的收敛半径,并讨论 时的敛散性。
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反馈参考答案：
举一反三
【单选题】The device capable of storing electrical energy in an electric field is called a condenser or a ________________.
A.
resistor
B.
capacitor
C.
inductor
D.
coil
【单选题】The device capable of storing electrical energy in an electric field is called a capacitor or a ________________.
A.
resistor
B.
inductor
C.
condenser
D.
capacitance
【简答题】气质类型有（ ）等学说。
【判断题】An electrical source is a device that is capable of converting non-electric energy to electric energy.
A.
正确
B.
错误
【单选题】The device capable of storing electrical energy in an electric field is called a capacitor or a ________________.
A.
resistor
B.
condenser
C.
inductor
D.
coil
【单选题】The device is said to be capable of _________ one spoken language into another.
A.
converting
B.
diverting
C.
transiting
D.
transferring
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