feil_ The working directory on the left of uvission4 disappears

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Introduction problem description

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feil_uVission4 After manually hiding the work directory on the left , Open the project file to prompt that the file has been opened .

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One 、 terms of settlement

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Solution ：
menu ->view Check the required project windows

summary

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That's what we're going to talk about today , Study 51 Single chip microcomputer , Use keil4 Pit encountered .