What is the right expression to determine the degree of freedom for a mechanism?
A、F＝3n－2PL－PH;
B、F＝3n－2PL;
C、F＝3n－PL－PH;
D、F＝3n－2PL－2PH
发布时间：2025-02-03 11:24:42
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答案：F＝3n－2PL－PH
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