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  2. При лебедки (рис. 57) поднимают

При лебедки (рис. 57) поднимают груз массой 1 т на высоту 5 м. Вычислите работу, которую надо произвести для этого

irichkagolikova irichkagolikova    2   17.04.2019 00:50    4

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крмоири крмоири  31.05.2020 12:26

1. двояковогнутые линзы

2. 3.крупные вены

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