单选
●下列选项 (48) 是单向标记。
(48)
- A． &n
- bsp; B．
</li> <li>C．<FRAMESET> </li> <li>D．<FORM></li> </ul> </div> <div class="source"> 试题出自试卷<a href="/paper/view202103162314305386057728.html" >《2011年网络管理员考试考前密卷（二）-上午试题》</a> </div> <fieldset class="field-title"> <legend class="t-c">参考答案</legend> </fieldset> <div id="answer" data-qid="168542200508977152"> </div> <div class="functions"> <a href="/paper/view202103162314305386057728.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">查看试卷详情</a> <div id="popover" class="popover hide" role="dialog" aria-hidden="true" aria-modal="true" aria-labelledby="vip_nav"> <div class="weui-mask"></div> <div class="volume_model weui-dialog"> <div class="vip_top"></div> <div class="vip_label">温馨提示</div> <div class="vip_nav">该问题答案仅针对会员用户开放，请点击购买会员卡。</div> <a class="vip_open" href="/buy.html?qid=168542200508977152" id="buyvip">马上购买会员卡</a> <div class="vip_notes"> 我已购买会员卡， <a class="exp" href="https://mpassport.yqda.net/">登录账号</a> 继续查看答案 </div> </div> </div> </div> </div> </div> <div class="weui-panel questionlist"> <div class="weui-panel__hd"><i class="fa fa-yc-square"></i><span>相关试题</span></div> <div class="weui-panel__bd"> <ol class="question-list"> <li> <h3><a href="/question/20210410168542239620861952.html"><p>●In recent ye</p></a></h3> <ul> <li>ars，TCP／IP has also </li> <li>begun to be used by telephone </li> <li>companies to provi</li> <li>de faster,cheaper telephone (74) . 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