简述文书立卷对档案工作的意义。

在斯坦伯格(R．Stemberg，1988)的爱情三角形中，包括( )因素。

A．承诺

B．激情

C．性活动

D．亲密

类比法是化学学习中常用的方法，已知硝酸能把铁氧化成Fe（NO₃）₃，但当铁过量时，产物是Fe（NO₃）₂．某同学受此启发，提出一个相似的观点：氯气与铁反应，当Cl₂过量时生成FeCl₃，当铁粉过量时产物是FeCl₂．为了验证该观点是否正确，该同学将一定量铁粉与Cl₂恰好完全反应得到一固体物质A，然后通过实验确定其成分．探究过程如下：

（1）提出假设：

假设1：该固体物质是FeCl₂；

假设2：该固体物质是______；

假设3：该固体物质是______．

（2）设计实验方案：

取少量固体物质A于烧杯中，加适量水溶解，然后取两份A溶液分别进行实验，实验现象与结论如下表：

实验方法	实验现象	结论
在溶液中加入KSCN溶液	______．	固体物质中有FeCl3
在酸性KMnO4溶液中加入少量A	KMnO4溶液颜色无明显变化	固体物质中不含______

（3）已知Fe（NO₃）₂溶液为浅绿色，往Fe（NO₃）₂溶液中加入少量的稀硫酸，溶液颜色有何变化______，该变化过程的离子方程式为______．

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (1) numbers to accomplish this．Another responsibility is to provide control mechanisms at the transport level．UDP does this task at a very minimal level．There is no flow control mechanism and there is no(2) for received packet．UDP, however, does provide error control to some extent．If UDP detects an error in the received packet，it will silently drop it． The transport layer also provides a connection mechanism for the processes．The (3) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units，number them，and send them one by one．It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived，check and pass those that are (5) free, and deliver them to the receiving process as a stream．

（3）处应填（）。

A．jobs

B．processes

C．programs

D．users

水文地质勘探孔

去除黄曲霉毒素的理想方式是（）。

A.加热处理

B.碱处理

C.酸处理

D.水洗

E.水中浸泡