38 如圖所示差動對電路，電晶體之 β = 100，ro →∞，RC = 4 kΩ，I = 2 mA，VCC = -VEE = 10 V，取VBE(on) = 0.7 V，VCE(sat) = 0.3 V，VT = 25 mV，當 vB1 = vB2 = 0 時，iC1(iC2)之值約為何？
(A)0 mA
(B)0.01 mA
(C)1 mA
(D)2 mA