最終更新日：2025/11/21
The machinist selected a twist drill to bore a clean hole in the hardened steel, its conical point and spiral flutes quickly directing chips away from the cutting lips.
正解を見る
The machinist selected a twist drill to bore a clean hole in the hardened steel, its conical point and spiral flutes quickly directing chips away from the cutting lips.
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）
