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老师批语：
table{
background-color: aliceblue;
border-collapse: collapse;
border:solid yellow;
width:500px;
height:100px;
}
table,thead,tr,th{
width:500px;
height:50px;
border:solid yellow;
}
table,tbody,tr,td{
width:500px;
height:50px;
border:solid yellow;
}
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