Bruel & Kjaer 4939型自由场传声�?参数-价格-中国粉体罐�/title>

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} }); function showliuyan(me, showtype){ if(showtype==0){ //$("#Content").val($("#Content").attr('placeholder')); Content= document.getElementById('PopMsgFrom').Content.getAttribute('placeholder'); document.getElementById('PopMsgFrom').Content.value=Content; } if(showtype==1){ // $("#Content").val($(me).text()); alert($(me).text()); document.getElementById('PopMsgFrom').Content.value=$(me).text(); } $(".fxp").css("display","flex"); } function close_popwin(){ $(".fxp").css("display","none"); // 关闭虚拟电话后的留言� $(".dhxj").css("display","none"); $(".dhxjbox").css("display", "none"); $(".dhxjbox2").css("display", "none"); return false; } </script>  <div class="cpjs"> <div class="cpjs_tab"> <div class="js_cpjj" style="border-bottom: 3px solid #1479d7; color: #1479d7;">产品介绍</div> <div class="js_cxd">创新炸�/div> <div class="js_xgfa">相关方案</div> <div class="js_xgzl">相关资料</div> <div class="js_yhpl">用户评论</div> <div class="js_gsdt">公司动�?/div> <div class="js_wsj">问商宵�/div> </div> <script> $(function(){ // 切换 $(".cpjs_tab a").click(function(){ $(".cpjs_tab a").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><span>4939是用于高级值、高频率范围的自由场1/4英寸麦克风，使用了不锈钢的膜片和格栅，它能够工作在很高的温度环境中，**可达150℃、�/span></p><p><span><strong>用逓�/strong></span></p><p><span>1、高级值声音测诔�/span></p><p><span>2、高频测诔�/span></p><p><span><strong>基本参数</strong></span></p><table cellspacing="0" cellpadding="2" border="1" bordercolor="#f2f2f2" width="100%"><tbody><tr><td colspan="2"><span>型号</span></td><td><span>4939</span></td></tr><tr><td colspan="2"><span>适用亍�/span></td><td><span>自由圹�/span></td></tr><tr><td colspan="2"><span>标准</span></td><td><span>C</span></td></tr><tr><td colspan="2"><span>均压孓�/span></td><td><span>�?/span></td></tr><tr><td><span>直径</td><td><span>英寸</span></td><td><span>1/4</span></td></tr><tr><td><span>标称灵敏度（160Hz（�/span></td><td><span>mV/Pa</span></td><td><span>4</span></td></tr><tr><td><span>极化电压</span></td><td><span>V</span></td><td><span>200</span></td></tr><tr><td><span>频率响应�?#177;2dB（�/span></td><td><span>Hz</span></td><td><span>6.3�?00000</span></td></tr><tr><td><span>本底噪声</span></td><td><span>dB（A（�/span></td><td><span>28</span></td></tr><tr><td><span>电容</span></td><td><span>pF</span></td><td><span>6.1</span></td></tr><tr><td><span>下限频率�?3dB（�/span></td><td><span>Hz</span></td><td><span>0.3�?</span></td></tr><tr><td><span>工作温度范围</span></td><td><span>ℂ�/span></td><td><span>-40�?50</span></td></tr><tr><td><span>温度系数</span></td><td><span>dB/ℂ�/span></td><td><span>+0.003</span></td></tr><tr><td><span>压力系数</span></td><td><span>dB/kPa</span></td><td><span>-0.007</span></td></tr></tbody></table><p><span><strong>传声器标准定么�/strong></span></p><p><span>表格中使用以下标准缩冘�/span></p><table cellspacing="0" cellpadding="2" border="1" bordercolor="#f2f2f2" width="100%"><tbody><tr><td></td><td><span>IEC 61094</span></td><td></td><td><span>IEC 61672</span></td><td></td><td><span>ANSI</span></td></tr><tr><td><span>A</span></td><td><span>IEC 61094-4 WS1F</span></td><td><span>I</span></td><td><span>IEC 61672 Class 1</span></td><td><span>K</span></td><td><span>ANSI S1.4 类型1</span></td></tr><tr><td><span>B</span></td><td><span>IEC 61094-4 WS2F</span></td><td><span>J</span></td><td><span>IEC 61672 Class 2</span></td><td><span>L</span></td><td><span>ANSI S1.4 类型2</span></td></tr><tr><td><span>C</span></td><td><span>IEC 61094-4 WS3F</span></td><td></td><td></td><td><span>M</span></td><td><span>ANSI S1.12 类型M</span></td></tr><tr><td><span>D</span></td><td><span>IEC 61094-4 WS1P</span></td><td></td><td></td><td></td><td></td></tr><tr><td><span>E</span></td><td><span>IEC 61094-4 WS2P</span></td><td></td><td></td><td></td><td></td></tr><tr><td><span>F</span></td><td><span>IEC 61094-4 WS3P</span></td><td></td><td></td><td></td><td></td></tr><tr><td><span>G</span></td><td><span>IEC 61094-1 LS1P</span></td><td></td><td></td><td></td><td></td></tr><tr><td><span>H</span></td><td><span>IEC 61094-1 LS2P</span></td><td></td><td></td><td></td><td></td></tr></tbody></table><p><span><strong>产品报价</strong></span></p><p><span>本商铺不提供网上报价，如需产品报价，请直接联系Bruel & Kjaer中国</span></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; font-size: 14px; margin: 10px 0 0; line-height: 26px;"> 暂无数据� </p> </div>  <div class="xgfa"> <div class="xgfa_tit"> <div> <span></span>相关方案 </div> </div> <div class="xgfa_box" style="display: block;"><div style="padding:10px;">暂无相关方案、�/div> </div> </div> <script> $(function(){ // 切换 $(".xgfa_tit_ul li").hover(function(){ $(".xgfa_tit_ul li").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); var _index = $(this).index(); $(".xgfa_box").css("display","none"); $(".xgfa_box").eq(_index).css("display","block"); }); }); </script>  <div class="xgzl"> <div class="cxd_tit"><span></span>相关资料</div> <div class="xgzl_box"><div style="padding:10px;">暂无数据、�/div> </div> </div>  <div class="yhpl"> <div class="cxd_tit"><span></span>用户评论</div> <form id="FormComments" action="" method="post" onsubmit="return false"> <input name="SaveProComments" id="SaveProComments" type="hidden" value="yes" /> <input name="ProductID" id="ProductID" type="hidden" value="286224" /> <input name="ProQuality" id="ProQuality" type="hidden" value="10" /> <input name="ProService" id="ProService" type="hidden" value="10" /> <input name="ProUsability" id="ProUsability" type="hidden" value="10" /> <input name="ProCostperformance" id="ProCostperformance" type="hidden" value="10" /> <div class="yhpl_pf"> <div> <p>产品质量</p> <div><span id="Quality" class="stars star10"></span><span id="Quality_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>售后服务</p> <div><span id="Service" class="stars star10"></span><span id="Service_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>易用�?/p> <div><span id="Usability" class="stars star10"></span><span id="Usability_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> <div> <p>性价毓�/p> <div><span id="Costperformance" class="stars star10"></span><span id="Costperformance_Val" class="ScoreVal" curScore="10">10刅�/span></div> </div> </div> <div class="yhpl_pftit">评论内容</div> <textarea name="Comments" id="ProComments" onfocus="checklogin();" placeholder="分享产品使用经验/采购评价（不超过500字）">