题目内容

阅读下列说明，回答问题1至问题3，将解答填入的对应栏内。
[说明]
某网上书店后台数据库的部分关系模式如下：
会员(会员编号，用户名，密码，姓名；地址，邮编，电话，消费额，积分)
图书(图书编号，类型名称，图书名称，作者，出版社，出版日期，ISBN，价格)
订单(订单编号，用户名，销售额，订购日期，出货日期)
订单明细(订单明细编号，订单编号，图书编号，数量)
下面是创建订单关系的SQL语句，订单编号唯一识别一个订单，用户名为订购图书的会员用户名，且不能为空。要求订购日期不能大于出货日期。请将空缺部分补充完整。
CREATE TABLE 订单(
订单编号 CHAR(6) (a)
用户名VARCHAR(40)NOT NULL (b)，
销售额FLOAT,
订购日期DATE NOT NULL，
出货日期DATE (c))；

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&8226;In most of the lines41-52thereisone extra word. It is either grammatically incorrect or does not fit in with the meaning of the text. Some lines, however, are correct.
&8226;If a line is correct, write CORRECT on your Answer Sheet.
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Products have a limited life, not only from the consumer's viewpoint, but also when as far as the producer is concerned. For example, a particular model
41. of car might last 5 years before production is stopped and it is replaced
42. for by a completely new model. New inventions and technology
43. have to made many products obsolete. Fashion can be another major
44. as influence on the life of a product. Some products survive because
45. they now sell after in different areas. Products, since they have a
46. limited life, all have a life cycle. It is obvious that different products
47. are last for different lengths of time but their life cycles have certain
48. common in elements which can be described as the introduction, growth
49. and maturity stages. The length of the product's life cycle can often be
50. extended by a modifying the product in some way and this is often done by
51. companies to keep their products on the market for a longer period.
52. Provided that the product remains so competitive, this can be much less expensive than developing a new model.
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