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9. Nyboer theoretically discovered in 1940 that changes in impedance can be used to determine changes in the cross-sectional area of blood vessels. Impedance is the resistance of a conductor in an alternating current circuit (frequency ω). There are various substances with different resistivities within the human body, so the human body exhibits a significant capacitance. The circuit composed of resistance R and capacitance C can be divided into series and parallel configurations. In the case of resistance and capacitance in series, what is the impedance Z?
(A)
(B)
(C)
(D)
(E)
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統計： A(0), B(0), C(0), D(0), E(2) #3421204
統計： A(0), B(0), C(0), D(0), E(2) #3421204
