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We have all been so impressed with your abilities and potential that we are pleased to offer you a position.

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We deal with a lot of foreign customers and are considered to be one of their most reliable agents.

下列叙述正确的是。

A. 实际电压源和实际电流源不能等效变换
B. 实际电压源和实际电流源变换前后内部不等效
C. 实际电压源和实际电流源变换前后对外不等效
D. 理想电压源与理想电流源存在等效变换

一个由20V的理想电压源和R=5Ω的电阻构成的串联电路，可以用和的电阻相_______（串联/并联）来等效。

A. 20A的理想电流源，5Ω，串联
B. 4A的理想电流源，4Ω，并联
C. 4A的理想电流源，4Ω，串联
D. 4A的理想电流源，5Ω，并联