液化石油气管道按工作压力可分为（）级。（）管道压力大于4.0兆帕；（）管道压力为1.

Michael Jordan是Jim最喜欢的运动明星，请跟Jim一起阅读下面这篇短文，读完后判断正（T）误（F）,看看谁的记忆力最好?

Michael Jordan is the best basketball player in the world. He was born in New York in 1963. There are 5 children in his family. He is the fourth one. When he was a child, he was small but clever. So he played basketball very well.

When he was a middle school student, he was the star of each game and he could score 40 points（分数）in a game. In 1984, he played in the US men’s Olympic Basketball Team .And later（后来）he played for the Chicago Bulls.

小题1:Michael Jordan is a football player.

小题2:Michael Jordan comes from America.

小题3:Michael Jordan could play basketball very well when he was a child.

小题4:Michael Jordan was small when he was a child.

小题5:Michael Jordan played for the Chicago Bulls first, then for the US men’s Olympic Basketball Team.

男性，18岁，不慎被车床击伤左胸部来急诊，检查时高度怀疑有心包积血，此时可能出现下列哪种脉搏（）

A.交替脉

B.短绌脉

C.奇脉

D.水冲脉

E.细脉

关于气雾剂特点的叙述错误为

A.具有速效和定位作用

B.具有缓释作用

C.稳定性好

D.可避免肝首过效应

To test eggs , ___them in a bowl of water: if they float they are bad; if they sink they are good.

A．put

B．putting

C．to put

D．to be putting

[说明]

图书管理系统详细记录图书库存情况、读者信息以及读者借阅记录(包括借书日期和还书日期)。

新书入库时要为该书编制图书卡片，包括分类目录号、图书流水号(要保证每本书都有唯一的流水号，即使同类图书也是如此)、书名、作者、内容摘要、价格和购书目期。同一个书名由于版次、作者等不同有可能存在多“种”图书，其间用“分类目录号”区分。

系统为每一位合法读者编制一个唯一的借书证号，读者需要提供姓名、单位。

一个读者最多可以同时借阅5本图书。借阅图书时，新添借阅记录，并将对应的“归还标记”字段置为“false”，表示“尚未归还”；归还图书时，将相应的“归还标记”字段置为“true”，表示“已经归还”。一本书可能供多位读者借阅，同一本书读者可以重复借阅。

图2-1为该系统的E-R图。

[图2-1]

由于同一个分类目录号(同一种图书)有多个副本，若用表Book(图书流水号，分类目录号，书名，作者，内容摘要，价格，购书日期)存储图书信息则有很多的冗余信息，该如何分解使之满足BCNF，并指出分解后的关系模式的主键。