15. 如下圖所示之電路,若電晶體β= 100、R1 = 30kΩ、R2 = 3kΩ、RE = 1.3 kΩ、RC = 9 kΩ、VBE = 0.7V,VCC =22V,則VCEQ =?(A)22.6(B)5.5(C)16.3(D)11.7 V。