male screw thread 中文意思是什麼
male screw thread
解釋
外螺紋-
Low pressure bronze male screw - thread check valve for marine use
船用低壓外螺紋青銅止回閥 -
Low bressure bronze male screw - thread check valve for marine use
船用低壓外螺紋青銅止回閥
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