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Assuming that the DC operating points of all the following amplifier circuits are normal, all of the capacitors to AC signal can be regarded as a short circuit, and which circuit has the lowest input resistance （ ）
Assuming that the DC operating points of all the following amplifier circuits are normal, all of the capacitors to AC signal can be regarded as a short circuit, and which circuit has the lowest input resistance （ ）
A、
B、
C、
D、
E、
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