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但当时大家都是做出口，国内的货是出口尾单，所以这些线缆都是 1.8 米，1.8 米就是 6 英尺，国外都是这个标准。

system of equations has a single solution that can be calculated by

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arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.

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