单选2．属于体积流量计的是（    ）。

A、<span style="font-size:16px;font-family:宋体">超声流量计</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span>

B、<span style="font-size:16px;font-family:宋体">科式力质量流量计</span>

C、<span style="font-size:16px;font-family:宋体">量热式质量流量计</span><span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</span>

D、<span style="font-size:16px;font-family:宋体">角动量式质量流量计</span>