单项选择题：用于肝病患者时要密切观察血象变化的是( )。 A．地高辛 B．洋地黄毒苷 C．并用

题型：读图填空题

生物学是指研究和的科学。

查看答案

题型：阅读理解

Humpback whales are sometimes called performers of the ocean. This is because they can make impressive movements when they dive. The name “humpback”, which is the common name for this whale, refers to the typical curve shape the whale’s back forms as it dives. Sometimes the humpback will dive with a fantastic movement, known as a breach. During breaching the whale uses its powerful tail flukes to lift nearly two-thirds of its body out of the water in a giant leap. A breach might also include a sideways twist with fins stretched out like wings, as the whale reaches the height of the breach. A humpback whale breathes air at the surface of the water through two blowholes which are located near the top of the head. It blows a double stream of water that can rise up to 4 meters above the water. The humpback has a small dorsal fin located towards the tail flukes about two-thirds of the way down its back. Other distinguishing features include large pectoral fins, which may be up to a third of the body length, and unique black, and white spots on the underside of the tail flukes. These markings are like fingerprints: no two are the same. Humpback whales live in large groups. They communicate with each other through complex “songs”.	Quick Facts
	Size:	14m~18m in length 30~50 tons in weight
	Living environment:	Open ocean and shallow coastline waters
	Migration:	From warm tropical (热带的) waters, where they breed, to cold polar waters, where they eat.
	Diet:	Shellfish, plants and fish of small size
	Hunting:	Sometimes in groups, in which several whales form a circle under the water, blowing bubbles that form a “net” around a school of fish. The fish are then forced up to the surface in a concentrated mass.
	Current state:	Endangered: it is estimated that there are about 5000~7000 humpback whales worldwide.

小题1:According to Quick Facts, a humpback whale ______.

A．cannot survive in waters near the shore

B．doesn’t live in the same waters all the time

C．lives mainly on underwater plants

D．prefers to work alone when hunting food

小题2:To make a breach, a humpback whale must ______.

A．use its tail flukes to leap out of the water

B．twist its body sideways to jump high.

C．blow two streams of water

D．communicate with a group of humpbacks.

小题3:From the passage we can learn that a humpback whale ______.

A．has its unique markings on it tail flukes

B．has black and white fingerprints

C．gets its name from the way it hunts

D．is a great performer due to its songs

查看答案

题型：问答题

【说明】 Plug-gw是Linux配置中常带的通用代理程序，可用来代理POP3、HTTP等应用层服务。附图3为某网络结构图，内部网段上有一台POP3服务器和一台FTP服务器。代理服务器中使用ipchains包过滤技术来实现防火墙功能。

ipchains的部分相关信息如下：

/sbin/ipchains-A input-p tcp-s 0.0.0.0/0 1024:-d 192.168.11.2/32 ftp-I eth0 - j ACCEPT

/sbin/ipchains-A input-p tcp-s (1) 1024:-d 192.168.80.2/32 (2) -I eth0 - j DENY

/sbin/ipchains-A input-p tcp-s 0.0.0.0/0 1024:-d 192.168.11.2/32 ftp-data-I eth0 - j ACCEPT

/sbin/ipchains-A input-p tcp-s 192.168.11.2/32 ftp-d 0.0.0.0/0 1024:-I eth1 - j ACCEPT

/sbin/ipchains-A input-p tcp-s 192.168.11.2/32 ftp-data-d 0.0.0.0/0 1024:-I eth1 - j ACCEPT

/sbin/ipehains-A input-p tcp-s 192.168.11.0/24 1024:-d 0.0.0.0/0 ftp-I eth1-j ACCEPT

/sbin/ipchains-A input-p tcp-s (3) 1024:-d 0.0.0.0/0 ftp-data-I (4) - j DENY

/sbin/ipchains-A input-p tcp-s 192.168.11.0/24 1024:-d 0.0.0.0/0 ftp-data-I eth1 - j ACCEPT

/sbin/ipchains-A input-p tcp-s 0.0.0.0/0 ftp-d 192.168.11.0/24 1024:-I eth0-j ACCEPT

/sbin/ipchains-A input-p tcp-s 0.0.0.0/0 ftp-data-d 192.168.11.0/24 1024:-I eth0 - j ACCEPT

【问题1】简述本题中POP3服务的实现过程。

查看答案

题型：选择题

A、B在某个点电荷电场中的一根电场线上，在线上A点处放入一个自由的负电荷，它将由静止向B点运动，下列判断哪些是正确的（　　）

A．场强方向由B指向A，该电荷做加速运动，加速度越来越小

B．场强方向由B指向A，该电荷做加速运动，其加速度大小的变化由题设条件不能确定

C．场强方向由A指向B，电荷做匀加速运动

D．场强方向由B指向A，电荷做加速运动，加速度越来越大

查看答案

题型：填空题

后现代风格反对（）的观点，主张与（）相联系，在传统中寻求创作的灵感。后现代风格主张（），用传统的装饰符号与新的装饰元素混合，以求得设计语言的双重译码。

查看答案

用于肝病患者时要密切观察血象变化的是( )。 A．地高辛 B．洋地黄毒苷 C．并用

题目：

答案：