请教

xiong19811209

<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 90.45pt; TEXT-INDENT: -53.25pt; mso-list: l0 level1 lfo1; tab-stops: list 90.45pt;"><font face="宋体"><font size="4"><span lang="EN-US" style="mso-fareast-font-family: &quot;Times New Roman&quot;;"><span style="mso-list: Ignore;"><span style="FONT: 7pt &quot;Times New Roman&quot;;"><font size="5">这是我在一篇文章上看到的：</font>&nbsp;&nbsp;&nbsp; </span></span></span><b><span lang="EN-US">a</span></b><b><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">、</span><span lang="EN-US">b</span></b><b><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">双方通话</span></b><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">。</span><span lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机把</span><span lang="EN-US">b</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">用户的发送线和</span><span lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机中继端口的发送线连接起来，</span><span lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机把中继端口的接收线和</span><span lang="EN-US">a</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">用户的接收线连接在一起。</span><span lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机把</span><span lang="EN-US">a</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">用户的发送线和</span><span lang="EN-US">A</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机中继端口的发送线连接起来，</span><span lang="EN-US">B</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">交换机把中继端口的接收线和</span><span lang="EN-US">b</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">用户的接收线连接在一起。这样双方就可以通话了。</span></font></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 90.45pt; TEXT-INDENT: -53.25pt; mso-list: l0 level1 lfo1; tab-stops: list 90.45pt;"><font face="宋体"><font size="4"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;"></span></font></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 90.45pt; TEXT-INDENT: -53.25pt; mso-list: l0 level1 lfo1; tab-stops: list 90.45pt;"><font face="宋体"><font size="4"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &quot;Times New Roman&quot;; mso-hansi-font-family: &quot;Times New Roman&quot;;">想请教一下，电话线是否分收和发？</span></font></font></p></span>