腔肠动物所特有的结构是()A、身体次生性辐射对称 B、具完全消化道 C、具有刺细胞

题型:单项选择题

问题:

腔肠动物所特有的结构是()

A、身体次生性辐射对称

B、具完全消化道

C、具有刺细胞

D、具有链状神经系

考点:生物学腔肠动物腔肠动物题库
题型:单项选择题

电网为三相四线制中线接地,电气设备外露金属部分单独直接接地而不与中线相连,这样的系统叫做( )。

A.TT系统

B.IT系统

C.TN-C系统

D.TN-S系统

题型:单项选择题

The Mysterious Universe

By Ellen Jackson and Nic Bishop

How did the universe begin? How big is it? What is dark matter? Cosmologist(宇宙哲学家)and expert supernova(超新星)hunter Alex Filippenko hopes that supernovas can help us answer some of these questions. But first we’ve got to find them! Join Alex and his team as they go on the hunt with huge telescopes and banks of computers.

The Time and Space of Uncle Albert

By Russell Stannard

What would you say if your uncle asked you whether you would like to go into space? You’d say, “When do I leave?”, just like the girl in this story. Gedanken is speeding across the universe trying to help her uncle answer some questions, such as “How big is space?” and “Where does gravity come from?” Along the way she also discovers how to get heavier without getting fat, how to live forever without knowing it, and the strange things that can happen when you go really fast.

George’s Secret Key to the Universe

By Lucy Hawking and Stephen Hawking

When George chases his pet pig through a hole in the fence, little does he expect that he will soon be riding a comet(彗星)around Saturn(土星). But just as he discovers the joys of space exploration with the computer Cosmos, which can open doors anywhere in the universe, everything starts to go wrong. When George’s lest-favorite teacher steals Cosmos and traps his friend’s dad in a black hole, can George set things right in time?

A Child’s Introduction to the Night Sky

By Michael Driscoll

With a telescope or without one, this book can get you started exploring planets, stars and even strange stuff like time, space, and black holes. The universe is a big place, but this book comes with a handy star finder that you can take out with you at night to help you find your way around the stars. Look up and discover the universe!

小题1:According to the text, Alex Filippenko ______.

A.invented huge telescopes

B.is looking for supernovas

C.doesn’t need many computers

D.knows a lot about dark matter小题2:What do we know about George’s Secret Key to the Universe?

A.It is a sad story

B.It is about a pet pig

C.It is a co-authored book

D.It is based on a real life story.小题3:Which book would you read if you want to know about gravity?

A.The Mysterious Universe

B.The Time and Space of Uncle Albert

C.George’s Secret Key to the Universe

D.A Child’s Introduction to the Night Sky.小题4:What do the four books have in common?

A.They have the same topics?

B.They are intended for adults.

C.They have the same number of characters

D.They leave many questions to the readers

题型:单项选择题

接待工作的要求有哪些?

题型:单项选择题

小母线施工注意的问题?

题型:单项选择题

信息的公开、透明和民主化的进程,让每个人可以找到自己才能得以释放的机会,让每个人的个性都可以得到发展。

更多题库