在网页开发过程中，让低版本浏览器支持媒体查询需要引入的JS文件是（ ）
A. respond.js
B. underscore-min.js
C. html5shiv.min.js
D. jquery.min.js
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下列选项中，属于viewport元标签的是（）
A.
<br> B. <meta/><br> C. <head><br> D. <html><br></p><div class="getanswer"><a href="/q/OjJv2y.html"> 查看答案 </a></div></div><div class="queslist-item"><div class="queslist-title"><h3>在移动端浏览器中，视窗视口指的是（）</h3></div><p class="queslist-options"> A. 理想视口<br> B. 布局视口<br> C. 可见视口<br> D. 视觉视口<br></p><div class="getanswer"><a href="/q/ZYWDVP.html"> 查看答案 </a></div></div><div class="queslist-item"><div class="queslist-title"><h3>下列选项中，用于设置弹性盒flex容器为单行的是（ ）</h3></div><p class="queslist-options"> A. flex-wrap：wrap-reverse;<br> B. flex-wrap：wrap;<br> C. flex-wrapn：row;<br> D. flex-wrap:nowrap<br></p><div class="getanswer"><a href="/q/lMqbx6.html"> 查看答案 </a></div></div><div class="queslist-item"><div class="queslist-title"><h3>下列关于栅格系统说法错误的是（）</h3></div><p class="queslist-options"> A. 栅格系统用于通过一系列的行与列的组合来创建页面布局<br> B. 内容应当放置于“列”内，并且，只有“列”可以作为行”的直接子元素<br> C. 栅格系统中的列是通过指定1到16的值来表示其跨越的范围<br> D. 通过为“列”设置 padding 属性，可以设置列与列之间的间隔<br></p><div class="getanswer"><a href="/q/R3y7wq.html"> 查看答案 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