CPU226 型 PLC 有几个通讯端口（    ）

A、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">2</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px">个</span><span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px"> </span>

B、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">1</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px">个</span>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">3</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px">个</span>

D、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">4</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px">个</span>