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单项选择题
HTML文档都必须包括、
、这三种元素，其文件基本架构中
指明（）</p><p>A.文件头开始</p><p>B.文件头区内容</p><p>C.文件开始</p><p>D.正文区开始</p>
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<p>参考答案：<b>B</b></p> </div>
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<a href="https://app.ixiawen.com/question/12891085/0fce110698e886e379b05773a37d3257.html" class="black" target="_blank"><p>下列说法错误的是（ ）</p><p>A．物体受到的合外力方向与速度方向相同时，物体做加速直线运动</p><p>B．物体受到的合外力方向与速度方向成锐角时，物体做曲线运动</p><p>C 物体受到的合外力方向与速度方向成钝角时，物体做减速直线运动</p><p>D．物体受到的合外力方向与速度方向相反时，做减速直线运动</p></a>
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<a href="https://app.ixiawen.com/question/22655093/f665b90ff0ea3be63f34772087f81e29.html" class="black" target="_blank"><p>下述哪项是外科感染的特点</p><p>A．多以局部表现为主</p><p>B．常为单一致病菌所致</p><p>C．一种化脓菌可引起不同类型的感染</p><p>D．转归取决于细菌毒力及机体抵抗力</p><p>E．分成化脓性感染及特异性感染2类</p></a>
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