关于筷子支点杠杆问题_筷子是费力杠杆支点在一端对吗
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window.onload = function () {
document.getElementById("mainFrame").src= "http://batit.aliyun.com/alww.html?id=00000000003727666140";
}
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(-__-)b
window.onload = function () {
document.getElementById("mainFrame").src= "http://batit.aliyun.com/alww.html?id=00000000003727666140";
}
≥▂≤
∪△∪