植物细胞杂种选择的方法有哪几种?

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问题:

植物细胞杂种选择的方法有哪几种?

考点:细胞工程细胞工程题库
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What’s the most important thing for you to have in your life? Someboy mentions hard-work, others suggest knowledge, love and luck.

If you arrange the 26 English letters alphabetically(按字母表的顺序)and use numbers to represent each of them, for example, 1 for a, 2 for b, 3 for c…, you can change an English word into a number. So hard-work becomes 8+1+18+4+23+15+18+11="98," meaning 98 is its mark; knowledge: 11+14+15+23+12+5+4+7+5="96," while love :12+15+22+5="54," and luck : 12+21+3+11="47," a small mark. None of these words can give one a full mark. What about money or prayer(祈祷)? They can’t , either.

Then what else? Don’t be worried. You can always find an answer to a problem in your life, when you change your way of looking at things or doing things, or your attitude(态度).Yes, attitude is the word. See for yourself: attitude:1+20+20+9+20+21+4+5=100,a full mark.

Different attitudes lead to different courses of life. Most times people hope for a better life. It is possible that one will have a change for the betterr after one has changed one’s attitude.

When you change your manner and became friendly towards others, you’ll meet more smiling faces towards you.In the same way, if you take a positive(积极地)attitude towards failure(失败),you’ll find it’s also rewarding though it has caused you losses.

小题1:In the writer’s opinion , what is the most important things in a person’s life?

A.Hard-work.

B.Knowledge.

C.Money.

D.Attitude.小题2:According to the passage, if you meet with problems, the best way out is to ___________.

A.ask for helpf from others

B.say your prayers to God

C.change your attitude

D.try maths-solving methods小题3:From the passage we can learn that ______________.

A.diffrent attitudes come from different courses of life.

B.mathematics can solve every problem easily in our daily life

C.failure sometimes can bring you good if you take a positive attitude

D.none of the English words except “attitude” equals to 100 or more

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动脉韧带位于( )

A.主动脉和肺动脉的起始处

B.左肺动脉起始部和主动脉弓下缘之间

C.右肺动脉起始部和上腔静脉之间

D.胸主动脉起始部和主动脉弓下缘之间

E.主动脉升部和上腔静脉之间

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当巷道坡度大于多少时,严禁采用人力推车?

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在实际应用中定义:巷道开掘前所处位置的最大主应力与巷道围岩岩石单向抗压强度的比值为()。

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()在《答刘禹锡天论书》中,进一步阐述了他的“天人不相预”的观点。

A.白居易

B.韩愈

C.柳宗元

D.范仲淹

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