Synthetic filament tow only: the tow must be drawn, that is to say, be incapable of being stretched by more than 100% of its length;
合成纤维长丝丝束，须经拉伸处理，即本身不能被拉伸至超过本身长度的一倍；
Its function is same to common tow-filament tungsten halogen lamp (9007) and increase illumination function by directly being replaced.
其功能与常用双灯丝卤钨灯(9007)相同，并可直接替换使用而提高照明功效。
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