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通过对共有的０型、Ⅰ型和Ⅱ型双曲柄机构之δｍｉｎ和δｍａｘ取值范围及相应判据的深入、系统研究，给出了关于判定双曲柄机构最小传动角三个命题的完备证明。
Through thorough and systematic research on the range of δmin and δmax and the corresponding criteria for the common type 0, type Ⅰ and type Ⅱ crank mechanism, the complete proof of the three propositions for determining the minimum transmission angle of the double crank mechanism is given.