题目内容
以下哪个是安全帽的防护原理之一
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安全带按照使用条件的不同，可分为（）的类别。
在HTML页面img标签中 ,用来设置图片不存在时显示提示文字的属性是:()
下面的标记用于表示HTML文档的结束的是:()
在Html标记中,哪个标记表示表格()
B.
C.
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C.