数据网络调试中经常用到Traceroute(路由跟踪)工具,在它的工作机制中,总共用

题型:单项选择题

问题:

数据网络调试中经常用到Traceroute(路由跟踪)工具,在它的工作机制中,总共用到了()种ICMP报文。

A.1

B.2

C.3

D.4

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题型:单项选择题

The World's Largest Insect

This giant insect can be used as a toy. A child ties one end of a string to a stick and the other end around the "neck" of an insect. Holding the stick, the child lets the insect go. With a loud whirring sound, the insect takes off, pulling the string in a large curve over the child's head. The child laughs as the stick jumps around. The child is African, and the toy is the African Goliath beetle, the largest insect in the world. 

The Goliath is a true insect because it has six legs and a body that is divided into three parts. Like all beetles, it has two pairs of wings. The front pair are thick and stiff and protect the back pair, which are soft. It is these soft back wings that make the beetle fly forward. They also cause the loud whirring sound the beetle makes when it flies. To steer, the beetle twists and turns its legs the same way you steer a bike by turning its front wheel. 

African children often use the Goliath beetle as a toy. Although it is over 15 centimeters long, it is quite harmless. 

小题1:The African Goliath beetle is _______.  

A.the world's largest insect

B.a toy used in many parts of the world

C.the only insect found in Africa

D.the world's smallest insect小题2:What made the whirring sound that the child heard?

A.The curved string.

B.The beetle's soft wings.

C.The beetle's six legs.

D.The beetle's body.小题3:We know the Goliath beetle is a true insect because it _______.  

A.makes a whirring sound when it flies

B.has both soft and hard wings

C.has six legs and a body with three parts

D.can fly小题4: When flying, the Goliath steers by_______.  

A.turning its soft back wings

B.twisting and turning its hard front wings

C.twisting and turning its legs

D.twisting and turning its whole body小题5: Where is the passage probably from ?

A.A story book .

B.A newspaper.

C.A student’s article

D.A science magazine .

题型:单项选择题

在经济评价中,一个项目内部收益率的决策准则为()。

A.IRR低于基准收益率

B.IRR<0

C.IRR大于或等于基准收益率

D.IRR>0

题型:单项选择题

观测隧道顶山体滑动主要采用()。

A、设观测网

B、设测标

C、进行地质分析

D、设专人观测

题型:单项选择题

引起耳疖常见的病因病机 、 。

题型:单项选择题

长沙旅馆形成行业始于哪个朝代?

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