（甲）明有奇巧人曰王叔远，能以径寸之木，为宫室、器皿、人物，以至鸟兽、木石，罔不因势象形，各具情态。尝贻余核舟一，盖大苏泛赤壁云。

    舟首尾长约八分有奇，高可二黍许。中轩敞者为舱，箬篷覆之。旁开小窗，左右各四，共八扇。启窗而观，雕栏相望焉。闭之，则右刻“山高月小，水落石出”，左刻“清风徐来，水波不兴”，石青糁之。

    （乙）沪邑元宵灯火，以伞灯为最。灯作伞形，或圆，或六角，咸以五色锦笺缀成，磨薄令如蝉翼，上镂人物、花鸟，细若茧丝。一灯之制，经岁始成，虽费百金不惜，但伞灯之出最迟，每俟诸灯兴阑，于百花生日前后始盛。多至二三百盏，间以五彩吴绫折枝花灯，偶缀禽、鱼、蝉、蝶，飞舞若生。又扎彩为亭，高可三四丈，名曰“抬阁”，间饰龙凤，以云母石为鳞甲，上下通明，光照数丈；或二层，或三层，每层以纹绣孩童，扮演杂剧，常扮《长生殿·玉环拜月》，兽炉中香烟一缕，烟际现月宫，姮娥立殿左，左右侍女，各执宫扇，肩上立牛女二星，望之如在霄汉也。每灯过处，绵亘数里，光耀如昼。笙箫鼓乐声彻夜不绝。而自通商后，无复有此盛事矣。同里张秋浦茂才《岁事衢歌》有“月夜笙箫步绿塍，珠常垂处小楼凭。吴绫输与谈笺纸,妙擅江乡算伞灯。”盖伞灯之制，纸贵于绫，谈笺，邑之土产也。

    雨苍氏曰：琐事耳，而插一叹想句，便寓绝大感慨。

【注】①锦笺，精致华美的纸。②兴阑，兴尽。③绫，比绸缎还薄的一种丝织品。④抬阁：一种民间的游艺项目。在木制的小阁里有人扮饰戏曲人物，由别人抬着游行。⑤姮娥，嫦娥。⑥茂才：秀才。⑦塍：田埂。⑧擅：独揽，独占。

（选自毛祥麟《墨余录》，有删改）

如图所示，在天花板上悬挂一轻质弹簧，当在弹簧下端挂上质量m₁=0.5kg的重物时，弹簧的长度L₁=22cm；当在弹簧下端挂上质量m2=0.75kg的重物时，弹簧的长度L₂=23cm．已知弹簧始终在弹性限度内，取g=10m/s²，求该弹簧的劲度系数k．

    It was a summer afternoon in the countryside. Wan Bo, a university student, was painting while his classmate Tang Qi was making a wooden box by the river. A little riding on a rocking horse caught their eye by chance. It brought them back to their childhood, warm and happy.

    "Why not try to make one by ourselves?" said Wan Bo. "You are good at making things and I am interested in painting."

    "Actions speak louder than words," Tang Qi said. Then, the two young men began to collect some information about it. During those days, watching videos about caring(雕刻) and shaping wood into horse shapes on the Internet became an important part of their life.

    Several months later, a wooden rocking horse appeared. They felt so excited that they put the picture of it on the Internet right away. To their surprise, it attracted lots of people's attention and some even hoped to order one.

    The two young men thought it might be a good chance. They sent some forms to the customers to make a survey. According to the result, they made each customer a special rocking horse. These horses were quite different from those produced in other factories, and they soon became popular among the customers.

    In the first year of their new hobby, Wan and Tang made thirteen rocking horses. Sometimes, they also repaired rocking horses for people. They made the old ones look new again. Wan and Tang helped those people bring back many happy memories.

    Their hobby has now become a successful and busy business.

电阻R₁、R₂串联接在电路中，R₁两端的电压为3伏，R₂两端的电压为9伏，R₁+R₂=600欧，求：

历史事件总是和历史人物紧密联系的。观察下面图片，回答问题。

请回答：