bootstrap需要导入的文件

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.0/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/popper.js/2.9.1/cjs/popper.min.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.0/js/bootstrap.min.js"></script>
    <title>Title</title>
</head>
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