在作用于刚体的任意力系上,如再加上或减去任意一个______,将不改变原力系的作用效应。
平衡力系
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下一篇:Complete the sentences with a word derived from the one in brackets. Nobody believed his ( )that he had not taken any books from the public library.(deny)
Complete the sentences with a word derived from the one in brackets.
Nobody believed his ( )that he had not taken any books from the public library.(deny)