如图所示，是某次物块做匀加速直线运动中，打出的一条纸带．如果使用的电源频率为50Hz，在纸带上相邻的两计时点的时间间隔为T₀，那么T₀为____ s．在纸带上取A、B、C、D四个计数点，纸带上A、C计数点之间的距离X_AC=10.56cm，B、D之间的距离X_BD=11.52cm，纸带打A点时的速度为____ m/s，打出此纸带时物块的加速度的表达式是____（用图中和题中所给物理量的字母表示），根据数据计算的结果是____ m/s²．（保留两位有效数字）

   Steven Jobs, the designer of Apple Computer, was not clever when he was in school. At that time, he was not a good student and he always made troubles with his schoolmates. When he went into college, he didn't change a lot. Then he dropped out（退学）. But he was full of new ideas.
   After he left college, Steven Jobs worked as a video game designer. He worked there for only several months and then he went to India. He hoped that the trip would give him some new ideas and give him a change in life. Steven Jobs lived on a farm in California for a year after he returned from India.
   In 1975, he began to make a new type of computer. He designed the Apple Computer with his friend in his garage (汽车库). He chose the name "Apple" just because it could help him to remember a happy summer he once spent in an apple tree garden. His Apple Computer was such a great success that Steven Jobs soon became famous all over the world.

古诗文名句默写（⑴⑵和⑶⑷各选做一题，⑸～⑽任选做四题）。

⑴ 海日生残夜，____  。（王湾《次北固山下》）

⑵ 问渠那得清如许？____ 。（朱熹《观书有感》）

⑶有约不来过夜半， ____  。（赵师秀《约客》）

⑷ ____ ，草色遥看近却无。（韩愈《早春呈水部张十八员外》）

⑸ 陆游《卜算子·咏梅》中赞美梅花即使化成泥土也不忘向人间播撒芳香的诗句是：____ ，____  。

⑹ 贫贱亦能安乐，富贵不可骄人。面对浮躁的世界，我们更需要坚守内心的安宁与从容，陶渊明《五柳先生传》中最能表明这一观点的句子是____ ，____  。

⑺ 诸葛亮在《出师表》中表明自己临危受命的句子是  ____ ， ____  。

⑻ 李白在《月下独酌》中以明月和身影反衬诗人内心孤独的诗句是____ ，____  。

⑼ 刘禹锡的《秋词》一反过去文人悲秋的传统，直接赞扬秋景胜过春光的诗句是 ____ ， ____  。

 ⑽ 韦应物在《滁州西涧》中以飞转流动之势衬托闲淡宁静之景的诗句是 ____ ， ____  。

（Ⅰ）将一个星期的商品销售利润表示成x的函数；

（Ⅱ）如何定价才能使一个星期的商品销售利润最大？