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本人因为旅游需要打印电子签证，但是提交后显示please verify the captcha before proceed，换了好几个浏… 看了一下，觉得没有触及实质的回答，所以补充一下。 这个问题的难点在于，很多人以为它们是限制多线程之间的执行顺序 （包括我写这篇回答时的最高赞回答看起来也是这么认为的）， 然而其实不是 … The free online stopwatch allows you to record split and lap times and edit...
