【单选题】【消耗次数:1】
在开环步进伺服系统中指令信号是单向流动的。该说法( )
正确
错误
参考答案:
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相关题目
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①  正确
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①  结构简单
②  使用维护方便
③  可靠性高
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①  正确
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①  正确
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①  正确
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【单选题】 开环伺服系统的主要特征是系统内()位置检测反馈装置。
① 
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【单选题】 开环伺服系统的主要特征是系统内( )位置检测反馈装置。
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