简述卵裂的几种方式?

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问题:

简述卵裂的几种方式?

考点:水产动物育种学水产动物育种学题库
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已知关于x的方程x2-3x+m=0的一个根是2,求m的值和方程的另一个根.

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阅读理解。

根据短文内容,从下框的A-F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余项。

A.The secret of the writer's success

B. A write with enduring popularity

C. Well-received creation to encourage Brits

D. The insight into human nature

E. Writing styles in different stages

F. The story appreciate for school students

1. (     )

    Charles Dickens is often thought of as one of England's great writers. Yet for many his language is 

old-fashioned and his story plots often improbable. Why, Dickens, out of so many other great English 

writers, has made the list? How then to explain Dickens's enduring popularity?

2. (     )

     One reason undoubtly is the British government's insistence that every child studies a Dickens novel at

school. Alongside Willian Shakespeare, Charles Dickens is a compulsory (必读的) writer on every English 

literature school reading list. His stories, though often over-long by today's standard,are superbly written

 moral tales. They are filled with colorful characters.

3. (     )

      But what makes his books stand out from other English writers is his insight into human nature. Dickens,

 like Shakespeare, tells us truths about human behavior that are as true to citizens of the 21st century as they

were to his readers in the 19th century. Readers have returned to Dickens's books again and again over the

years to see what he has to say about readers'own time.

4. (     )

     The BBC adapted one of his less well-known novels, Little Dorrit, into a popular television drama that 

 introduced many Brits to the novel for the first time. A dark story about greed and money, it was the perfect 

story to illustrate the bad times. No surprise then that it was Dickens Britons turned to, during the economic 

crisis last year, to make sense of world rapidly falling apart.

5. (     )

     Readers of the 19th and early 20th century usually prized Dickens's earlier novels for their humor and 

pathos (悲痛). While recognizing the virtues of these books, critics today tend to rank more highly the later

works because of their formal coherence and acute perception (洞察力) of the human condition. For as long

as Dickens's novels have something to say to modern audiences, it seems likely that he will remain one of 

Britain's best loved writers.

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对于扫描的影像是用于打印输出时,扫描仪分辨率应设置为()。

A.72ppi

B.150ppi

C.200ppi

D.300ppi

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未经许可,播放或者复制广播、电视的,属于()。

A.侵权行为

B.违法行为

C.犯罪行为

D.合法行为

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()的商品除了可以是有形的产品外,还可以是无形的服务。

A.广义

B.狭义

C.出口

D.内销

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