self-acting
To act in a polite or proper way.
(acting) The area in the center of the stage, especially one towards the front. / (by extension) An important or prominent position.
Acting of or by itself.
reduplicated by means of endoreduplication
自己作動式の弁は圧力が下がると閉じて、危険な漏れを防ぎました。
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