2[单选题]

<p style="TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体">二重积分<span><img style="VERTICAL-ALIGN: middle" height="39" width="256" src="http://www.jxjypt.cn/Content/Scripts/ewebeditor10/uploadfile/exam/201307/20130710151312099001.gif"></span>的值为<span>(<span>&nbsp;&nbsp;&nbsp; </span>)</span></span></p>
<p style="TEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: 'Times New Roman'; TEXT-ALIGN: justify"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体"><img style="VERTICAL-ALIGN: middle" height="41" width="39" src="http://www.jxjypt.cn/Content/Scripts/ewebeditor10/uploadfile/exam/201307/20130710151313714002.gif"><span>&nbsp;&nbsp; </span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><img style="VERTICAL-ALIGN: middle" height="41" width="45" src="http://www.jxjypt.cn/Content/Scripts/ewebeditor10/uploadfile/exam/201307/20130710151313115003.gif"><span>&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><img style="VERTICAL-ALIGN: middle" height="41" width="40" src="http://www.jxjypt.cn/Content/Scripts/ewebeditor10/uploadfile/exam/201307/20130710151313867004.gif"><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><img style="VERTICAL-ALIGN: middle" height="41" width="41" src="http://www.jxjypt.cn/Content/Scripts/ewebeditor10/uploadfile/exam/201307/20130710151313222005.gif"></span></p>

A.1/6

B.1/12

C.1/2

D.1/4