Последние добавленные видео:
圆珠笔芯
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2 years ago
14002 2 years ago 14:3814億人真真真造不出圓珠筆芯？【阿Test正經比比】
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3 years ago
302 3 years ago 1:10圆珠笔芯上的小钢珠，到底是怎样被塞进去的？看完解开多年疑惑！
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2 years ago
266030 2 years ago 5:42Can't write a ballpoint pen? Teach you a trick, don't spend a penny, you don't have to buy a new one
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2 years ago
650 2 years ago 4:58中国为何不愿制造圆珠笔？一炉送走全世界，我国咋怒灭全球厂商？
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3 years ago
32 3 years ago 1:37圆珠笔笔芯的滑珠是怎么放进去的？原来这么复杂，看完佩服我国技术
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3 years ago
27 3 years ago 1:13一根圆珠笔芯能写多长的距离？老外亲测，结果真是刷新认知！
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3 years ago
1113 3 years ago 4:12中国还是制造不出圆珠笔头？建造难度比航母还难？仅三国能造
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4 years ago
385 4 years ago 3:27【我的国139】中国真造不出圆珠笔芯吗？
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1 year ago
1054 1 year ago 1:23妈妈又买奇奇怪怪的笔，一提一拉秒出芯，小鱼儿直呼帅，好用吗？
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7 years ago
65 7 years ago 4:00中国之前造不出圆珠笔芯 一年400多亿支笔 好处全让日本得了
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9 months ago
30 9 months ago 14:37太原钢铁集团：“中国做不出圆珠笔芯？？？？？”
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3 years ago
62120 3 years ago 2:41用一只圆珠笔，就能做出98K？三块土豆放一起，就能保持平衡？