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【简答题】
已知铰链四杆机构中，b=50mm，c=35mm，d=30mm,AD为固定件。 （1）铰链四杆机构如果能成为曲柄摇杆机构，且AB为曲柄，求a的极限值； （2）铰链四杆机构如果能成为双曲柄机构，求a的取值范围。
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