【单选题】【消耗次数：1】
主、从动轴具有最大交角的万向节是( )。
①
球笼式
②
球叉式
③
双联式
④
三销轴式
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关于传动轴万向节的正确概论有：（）。
①
单十字轴万向节不等速；
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双十字轴万向节等速；
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双十字轴万向节实现等速传动的条件是：（）。
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两万向节的夹角相等。
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