21.在LC串聯直流電路中，已知電源電壓V = 50 V，VL = a，VC = b，則下列何者正確？
(A)a = 50，b = 0
(B)a = 0，b = 0
(C)a = 50，b = 50
(D)a = 0，b = 50

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統計： A(10), B(11), C(26), D(49), E(0) #932497