在控制流程图中，小圆圈代表某些自动化仪表，圆圈内如果标注为FT27，其意义包括（    ）

A、<span style="font-size:16px;font-family:宋体">此仪表是测量变送器</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp; &nbsp;&nbsp;</span>

B、<span style="font-size:16px;font-family:宋体">此仪表测量的是流量</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp;</span>

C、<span style="font-size:16px;font-family:宋体">此仪表是温度控制器</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp; &nbsp;</span>

D、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">27</span><span style="font-size:16px;font-family:宋体">表示回路号</span>

E、<span style="font-size:16px;line-height:150%">27</span><span style="font-size:16px;line-height:150%;font-family:宋体">表示仪表序号</span>