2005年我买了售价149美元的iPod Shuffles，当时她满足我所有的需求直到我发现最新款的Shuffles有显示屏，所以又用250美元买了新的，除了显示屏似乎没有太多新的功能。现在，MP3竞争升温，价格一降再降，甚至5美元就可以拥有一个。小型PLC也会如此吗？ 西门子推出的S7-1200小型控制器按不同型号，价格在200美元左右。罗克韦尔自动化MicroLogix800...[阅读全文]
I purchased one of the original iPod Shuffles back in 2005 for $149. It was completely functional and did everything I wanted it to do. That is until I played with an iPod that had a screen and I real[阅读全文]
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