三极管放大电路中，测得晶体管三个引脚对地电位分别为：UA = 3.3V、UB = 4V、UC =6 V， A、B、C对应的电极是（     ）。

A、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">C</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">B</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">E</span>

B、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">E</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">B</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">C</span>

C、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">E</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">C</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">B&nbsp;</span>

D、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">E</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">B</span><span style="font-size:16px;font-family:楷体_GB2312">，</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">C</span>