下述服用胰酶的注意事项中，正确的是（） A.与等量碳酸氢钠同服可增强疗效 B.不宜与

胶轮导轨系统中，无论是哪种车型，其相同的特点是车辆分设走行轮和（）。

A.导向轮

B.动力轮

C.悬挂轮

D.限制轮

女性患者，55岁，患支气管扩张症，病变在两肺下叶前基底支，为帮助其排出痰液应取

A．俯卧位
B．平卧位
C．侧卧位
D．膝胸位
E．头低足高位

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.

10（）

A.cracker

B.user

C.customer

D.client

学校化学实验室新购买的药品有：白磷、铝片、乙醇、硝酸、氢氧化钠等。

（1）从物质分类的角度看：属于金属单质的是        ；属于有机物的是          ；

（2）从物质存放方法的角度看：        

① 白磷应保存在盛有         的广口瓶中；

②硝酸保存在棕色细口瓶中，原因是见光易分解。硝酸见光分解的化学方程式： 4HNO₃4X↑＋O₂↑＋2H₂O ，其中X的化学式为                   ；

③氢氧化钠要密封保存，因为敞口放置容易变质。用化学方程式表示变质的原因          。

以汽车车身为例，生产过程可简单分为预处理、涂装、后处理三个主要工序。