鳃裂瘘管的外瘘口多位于胸锁乳突肌前缘。

某公司因与个体工商户李某发生债务纠纷，向法院申请诉前保全，查封李某运输汽车一辆。但该公司在法定期间内未对李某起诉，并因保全而给李某造成经济损失。按照民事诉讼法的规定，李某可以()。

A．向采取诉前保全的法院申请解除保全

B．向采取诉前保全的法院的上一级法院申请解除保全

C．向采取诉前保全的法院起诉要求该公司予以赔偿

D．向采取诉前保全的法院的上一级法院提起诉讼要求该公司予以赔偿

把影响某一装配精度的有关尺寸彼此按顺序连接起来可形成一个封闭外形，所谓装配尺寸链就是指这些相互关联尺寸的总称。

阅读理解

     The hippopotamus is, without doubt, one of the strangestlooking animals in the world.The ancient

Greeks named this large animal "hippopotamus, " which means "river horse." But hippos are not related

to horses.

     Found only in Africa, hippos come in two varieties.The small pygmy hippo lives in rain forests.And the

large common hippo lives mostly in grassland around rivers and lakes.

     The common hippo is the third largest land mammal in the world.It is lighter than the largest of the

white rhinos and the elephant, the heaviest land animal.The elephant is almost twice as heavy as the

common hippo.

      In the past, the hippo has been killed for meat, for sport, and for its tough skin.But today, in

preserves only, the common hippo has increased in number.The hippo has few predators(天敌) other

than lions and leopards that sometimes catch young hippos.There were many hippos killed by man during

the last half of the 19th century, when Africa was being explored and settled.And a great many hippos

and other animals were killed by poachers(偷猎者) during the fighting in Uganda in the 1970s.The hippo

is strong, though.It resists disease and has a long lifetime, living 20 to 40 years in the wild.

      Hippos spend most of their time in the water, only moving onto land at night to eat.By feeding at night, their skin is protected from the sun and the dry air that can cause a serious loss of moisture(水分).

      Because of its large body, the common hippo may appear awkward on land, but it can move very

fast and is considered by many to be the most dangerous animal in Africa.By spending their days in the

water and their nights on land, hippos make it difficult for scientists to study them, so there is still much to

be learned about hippos.The huge hippos, with their big mouths and tiny ears, have always fascinated

humans.As scientists learn more about them, they become even more fascinating.

1. We can learn from the passage that hippos ________.

A. have no connection with horses

B. can be found all over the world

C. are goodlooking animals

D. live mostly in rain forests

2. Which of the following may threaten the lives of hippos?

A. Rhinos.  

B. Water.

C. Lions.  

D. Elephants.

3. Why do hippos feed themselves at night?

A. It is cooler at night.

B. The air at night is fresher.

C. They try to avoid their predators.

D. The poachers don't come out at night.

4. Why is it difficult for scientists to study the hippo?

A. It can move fast.

B. Its number is decreasing.

C. It is the most dangerous animal.

D. It doesn't appear on land during the day.

铁路线路中“站线”是指（）、牵出线、货物线及站内指定用途的其他线路。

A.干线

B.到发线

C.调车线

D.支线

加工配制中，焊接钢管组对应符合下列规定（）。

A、单节管子长度不应小于500mm

B、其纵向焊缝应错开，且不应小于500mm

C、不得强力对口，手工调校用锤击打时应避免钢板表面损伤

D、卷管公称通径等于800mm的应采用双面焊接