问题
填空题
HTML标签分为单标签和双标签，
为（），
为（）。</p>
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<p>参考答案：单标签；双标签</p> </div>
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<span class="text_left reb">单项选择题</span>
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<a href="https://app.ixiawen.com/question/41794397/b5cdc1e7de69bf9b038dce6834352563.html" class="black" target="_blank"><p>如下图所示多跨梁的自重不计，则其支座B的反力R<sub>B</sub>的大小和方向为（）。</p><p><img src="https://img.ixiawen.com/uploadfile/2018/0126/20180126050930956.jpg" /></p><p>A．R<sub>B</sub>=90kN，方向铅直向下</p><p>B．R<sub>B</sub>=30kN，方向铅直向下</p><p>C．R<sub>B</sub>=30kN，方向铅直向上</p><p>D．R<sub>B</sub>=90kN，方向铅直向上</p></a>
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<span class="text_left reb">单项选择题</span>
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<a href="https://app.ixiawen.com/question/49825461/51503b82305f8925d57d23ec04436302.html" class="black" target="_blank"><p>治疗休克的关键是</p><p>A．纠正酸碱失衡</p><p>B．补充血容量</p><p>C．维护重要脏器功能</p><p>D．应用血管活性药物</p><p>E．应用肾上腺皮质激素</p></a>
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