lex
/
classroom-instruments


			
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  <title>老师端</title>
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<style>
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  .bgImg {
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  .btnImg {
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    position: absolute;
    left: 50%;
    margin-left: -144px;
    bottom: 31px;
    cursor: pointer;
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    top: 141px;
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    margin-left: -288px;
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