不幸的是，这种“座曲式”结构的键盘早就被“橡胶圆点”式键盘所取代了。后者的键帽下附有小按棒，按键被摁下时按棒就会触动分布在一层塑料薄膜上的橡胶圆点。
The buckling spring method, unfortunately, has long been replaced by the 'rubber dome,' where little sticks on the underside of the keys press down on rubber domes laid on a plastic underlay.
薄膜挤出吹塑是应用最广泛的塑料薄膜加工方法之一，而螺旋芯棒式机头则是应用最为广泛的、先进的吹膜机头。
Spiral mandrel blown-film die is advanced and widely used in film blowing which is one of the most popular processing for plastics film.
本发明涉及一种半导体薄膜内包层放大光纤及其预制棒制造方法。
The present invention relates to a semiconductor film internal cladding amplification optical fibre and its perform manufacture method.
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