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。