最終更新日：2025/11/20
The engineer applied a thin coating of molybdenum disulfide to the gears to reduce friction and extend their service life.
正解を見る
The engineer applied a thin coating of molybdenum disulfide to the gears to reduce friction and extend their service life.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
