简述正常人支气管呼吸音的发生机制及听诊部位。

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .

As administrators seek to block dangerous email attachments through the recognition of well-known (9) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (10) access to your network.

6（）

A.attachment

B.packet

C.datagram

D.message

小明同学在互联网上搜索“查理·马特改革”的相关资料，结合所学知识推测他想探究的主题是[ ]

A．西欧封建等级制度

B．日本大化改新

C．罗马共和国兴亡

D．罗马教廷

钢的牌号由代表（）、（）、质量等级符号、脱氧方法符号等4个部分按顺序组成。

依次填入下面一段文字横线处的语句，衔接最恰当的一组是( )。
在儒家传统中，孔孟总是形影相随，______。
①既有《论语》，则有《孟子》
②孔曰“成仁”，孟曰“取义”，他们的宗旨也始终相配合
③今人冯友兰，也把孔子比做苏格拉底，把孟子比做柏拉图
④既有大成至圣，则有亚圣
⑤《史记》说：“孟子序诗书，述仲尼之意。”

A．④②①③⑤
B．①②④⑤③
C．①④②③⑤
D．④①②⑤③

聚酯型人造石材按仿天然石材的品种分为（）种。

A.三

B.四

C.五

D.六