“direct drive valve actuator”的概念、定义、翻译、参考文献-科学参考

单词	direct drive valve actuator
释义	direct drive valve actuator Encyclopedia 工学直接驱动阀式作动器释 direct drive valve actuator直接驱动阀式作动器采用直接驱动阀（direct drive valve，简称DDV）作为主控阀的作动器。
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