13．磁感应强度是
<script>function viewparser(etype,eid){showWindow("showMsgBox", "plugin.php?id=tpgao_questionsyn:showMsg&timutype="+etype+"&item="+eid+"&credit=3&mod=sh", "get", 0);
}</script>[普通选择题]<br> 题目 13．磁感应强度是<br><br><img src=""><br>A.电场强度<br>B.垂直通过单位面积的磁场<br>C.垂直通过单位面积的磁通量<br>D.磁性最强的部位<br>E.磁体的导磁性<br><br>正确答案：C<br><div id="parserbtn"><input class="parserbtn"onclick="viewparser(1,11219);" type="button" name="parserbtn" value="查看解析" style="height: 23px"></div><br>
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