The problems in leakage protection and executive circuit of synthetical protection set in coal electric drill have been analyzed and calculated.

通过分析和计算说明老式煤电钻综合保护装置在漏电保护和执行电路中存在的问题。

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Before Mukherjee, Doug Moore, a former Circuit City executive, held the post.

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Circuit City Chief Executive AlanMcColloughAlan McCollough punctuated his firm's solid earnings report Monday with the unexpected announcement that he will retire next year.

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"For those that do it right it's a big deal, " says Scott Silverman, Shop.org's executive director, who cited Circuit City and Sears as chains that have effectively merged store and Web operations.

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