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علوم سال سوم راهنمائی - قرقره مرکب
شنبه 13 خرداد 1391  04:31 ق.ظ

قرقره مرکب:قرقره ای است که از ترکیب قرقر ه ثابت و متحرک بوجود می آید.




  • آخرین ویرایش:شنبه 13 خرداد 1391
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