选择一项:A. writing a ticketB. driving licenseC. break

选择一项:A. writing a ticketB. driving licenseC. breaking traffic rulesD. speedingE.

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力偶可在其作用面内任意移转,不会改变它对刚体的作用效果。×√

力偶可在其作用面内任意移转,不会改变它对刚体的作用效果。×√

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