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变更可更改的事项的效力表现为：被更改的原记载事项因更改而______，改写的记载事项______产生票据效力。
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简述票据变造的效力如何
某公司的部门(部门号，部门名，负责人，电话)、商品(商品号，商品名称，单价，库存量)和职工(职工号，姓名，住址)三个实体之间的关系如表4-8、表4-9和表4-10所示。假设每个部门有一位负责人和一部电话，但有若干名员工；每种商品只能由一个部门负责销售。 表4-8 部门表 部门号 部门名 负责人 电 话 001 家电部 E002 1001 002 百货部 E026 1002 003 食品部 E030 1003 表4-9 商品表 商品号 商品名称 单 价 库存量 30023 计算机 4800 26 30024 打印机 1650 7 … … … … 30101 毛巾 1 106 30102 牙刷 3.8 288 … … … … 表4-10 职工表 职工号 姓 名 住 址 E001 王军 南京路 E002 李晓斌 淮海路 E021 杨烨 江西路 E026 田波 西藏路 E028 李晓斌 西藏路 E029 刘丽华 淮海路 E030 李彬彬 唐山路 E031 胡慧芬 昆明路 … … … 表4-11 统计结果 职工号 姓 名 部门名 月销售额 E001 王军 家电部 528900 E002 李晓斌 家电部 368000 E021 杨烨 百货部 12500 E028 李晓斌 百货部 82500 E031 胡慧芬 食品部 282608 … … … … 部门关系不属于第三范式的原因是 (12) 。如果用户要求得到表4-11所示的结果，需要 (13) ，并增加关系模式 (14) 。
Text 1Until recently, the main villains of the piece had seemed to be the teachers’ unions, who have opposed any sort of reform or accountability. Now they face competition from an unexpectedly destructive force: the court. Fifty years ago, it was the judges who forced the schools to desegregate through Brown v. Board of Education (1954). Now the courts have moved from broad principles to micromanagement, telling schools how much money to spend and where—right down to the correct computer or textbook,Twenty-four states are currently stuck in various court cases to do with financing school systems, and another 21 have only recently settled various suits. Most will start again soon. Only five states have avoided litigation entirely.Nothing exemplifies the power of the courts better than an Il-year-old case that is due to be settled (sort of) in New York City, the home of America’s biggest school system with 1. lm students and a budget nearing $13 billion. At the end of this month, three elderly members of the New York bar serving as judicial referees are due to rule in a case brought by the Campaign for Fiscal Equity, a leftish advocacy group, against the state of New York: they will decide how much more must be spent to provide every New York City pupil with a "sound basic" education.Rare is the politician willing to argue that more money for schools is a bad thing. But are the courts doing any good Two suspicions arise. First, judges are making a lazy assumption that more money means better schools. As the international results show, the link between "inputs" and "outputs" is vague—something well documented by, among others, the late Senator Daniel Patrick Moynihan of New York. Second, the courts are muddling an already muddled system. Over time, they have generally made it harder to get rid of disruptive pupils and bad teachers.The current case could be even worse. The courts have already said that, in order to determine the necessary spending, they may consider everything from class size to the availability of computers, textbooks and even pencils. This degree of intervention is all the more scandalous because the courts have weirdly decided to ignore another set of "inputs"—the archaic work practices of school teachers and janitors. David Schoenbrod and Ross Sandler of New York Law School reckon the demands of the court will simply undermine reform and transform an expensive failure into a more expensive one.And of course, the litigation never ends. Kentucky, for example, is still in court 16 years after the first decision. A lawsuit first filed against New Jersey for its funding of schools in 1981 was "decided" four years later—but it has returned to the court nine times since, including early this year, with each decision pushing the court deeper into the management of the state’s schools. Bad judges are even harder to boot out of school than bad pupils. "Inputs" as used in the text refer to all of the following Except （）
一个草原上的某种草是田鼠的食物．但是由于这种草的变异，这一年该草的数量很少，但是田鼠的数量没有变化。解释这个现象。
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