在下面语段横线上选填正确的一组关联词语[ ] 有些人喜欢用显微镜去观察一片叶子,

题型:选择题

问题:

在下面语段横线上选填正确的一组关联词语[ ]

有些人喜欢用显微镜去观察一片叶子,有些人喜欢用肉眼去细看木头的年轮。______真正去认识一棵树,____必须从枝叶到根本,从过往的清风到枝干的神韵都注意到。同样,当我们正视生命时,____只从细枝末节着眼,______是对自己生命的一种侮辱。

A.但    却  如果  便   

B.因为   就  如果  便

C.而    却  因为  就   

D.但    就  因为  就

考点:关联词语
题型:选择题

     阅读理解

     When you are reading something in English, you may often meet with a new word. What's the best

 way  to know it?

     You may look it up in the English-Chinese dictionary. It will tell you a lot about the word: the

 pronunciation, the Chinese meaning and how to use the word. But how can you know where the word is

 thousands of English words? How to find it in the dictionary both quickly and correctly?

      First, all the English words are arranged (安排) in the letter order. In the dictionary you can first see

  the words beginning with letter A, then B, C, D…. That means, if there are two words "desert" and "pull", "desert" will be certainly before "pull". Then if there are two words both beginning with the same letter, you may look at the second letter. Then the third, the fourth…

1. This passage is about _____.

    A. new words in writing

    B. different dictionaries

    C. the best way of reading

    D. using an English-Chinese dictionary

2. In the dictionary you may not find _____.

    A. how to pronounce the word

    B. the spelling of the word

    C. who used the word first

    D. how to use the word

3. In an English-Chinese dictionary, the last word _____.

    A. begins with Z

    B. begins with A

    C. is a short one

    D. is not often used

4. Which group of words is in the right order in an English-Chinese dictionary?

    A. perhaps, produce, plenty 

    B. straight, subject, surprise

    C. century, center, business

    D. foreign, entrance, headache

5. In the passage the writer tries to tell us that _____.

    A. we have to use a dictionary when we read something in English

    B. an English-Chinese dictionary can tell us everything about a word   

    C. an English-Chinese dictionary can help us a lot in our English study

    D. all English-Chinese dictionary are the same

题型:选择题

一台“6V,15W”的直流电动机的电枢电阻为0.5Ω,接在电动势E=6V,内阻r=0.5Ω的电源上工作时,测得电动机两端电压是5V,求:

(1)电源的总功率;           

(2)电源的输出功率;         

(3)电动机的发热功率;     

(4)电动机的输出功率.     

题型:选择题

下列性状的变化是由基因控制的是 [ ]

A.经常参加体力劳动,手掌磨出了老茧

B.由于紫外线照射,皮肤变黑了

C.大眼睛的父母生出了大眼睛的孩子

D.经常近距离看书,视力下降

题型:选择题

扇形天线类型的划分方法是根据辐射能量衰减为()dB的波束宽度(BW)来确定的。具体可分为三类:33°(道路覆盖),65°(120°扇区)和90°(180°扇区)。

A.-1

B.-2

C.-3

D.-4

题型:选择题

氨蒸发器排油时需要将()液位连锁旁路。

A.氨蒸发器A

B.氨蒸发器B

C.辅助蒸发器

D.氨过热器

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