南柴胡与北柴胡气味的主要区别是南柴胡有A．辛辣味 B．芳香 C．微涩 D．具败油气

视野弓形暗点常见于以下疾病，除了（）。

A.青光眼

B.视 * * 先天性缺损

C.有髓神经纤维

D.缺血性视 * * 病变

E.视神经脑膜瘤

青石棉（cricidolite）是世界卫生组织确认的一种致癌物质。它的化学式为：Na₂Fe₅Si₈O₂₂(OH)₂，青石棉用稀硝酸溶液处理时，还原产物只有NO，下列说法正确的是

A．青石棉的化学组成用氧化物的形式可表示为：Na₂O·5FeO·8SiO₂·H₂O

B．该反应中氧化产物与还原产物的物质的量之比为3︰1

C．青石棉是一种易燃品，且易溶于水

D．适量Na₂Fe₅Si₈O₂₂(OH)₂能完全溶于足量硝酸中，得到澄清透明溶液

客车基础制动装置中衬套裂纹时，（）。

A.须焊修

B.须不超过2mm可继续使用

C.须整件报废

D.须重新镶套

西藏的拉萨海拔（）米。

A、1750.0

B、2500.0

C、3000.0

D、3750.0

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (56) from a friend who asks you to open it. This is what happens with Melissa and several other similar Email (57) . Upon running, such worms usually proceed to send themselves out to Email addresses from the victim’s address book, previous Emails, Web pages (58)
As administrators seek to block dangerous Email attachments through the recognition of well-known (59) , 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 (60) access to your network.

A．virtual

B．virus

C．worms

D．bacteria