【单选题】【消耗次数：1】
根据传动联系的性质，传动链可以区分为（ ）
①
内联系传动链、操纵和控制传动链
②
操纵和控制传动链、行程传动链
③
外联系传动链、内联系传动链
④
行程传动链、内联系传动链
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相关题目
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多级齿轮传动中，各级传动比相等的分配原则适用于按（?? ）设计的传动链。
①
输出轴的转角误差最小原则
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现代数控机床的主运动广泛采用无级变速传动，用交流调速电动机或直流调速电动机驱动，它们能方便地实现无级变速，且传动链短，传动件少，提高了变速的可靠性。该说法（ ）
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正确
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错误
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