商店出售的鞋子规格大小有两种表示方法“厘米”和“码”.已知19厘米相当于28码,

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问题:

商店出售的鞋子规格大小有两种表示方法“厘米”和“码”.已知19厘米相当于28码,13.5厘米相当于17码.那么23.5厘米相当于______码,______厘米相当于35码.

考点:长度单位间的换算
题型:填空题

▱ABCD中,AE平分∠BAD交BC于点E,将BC分成4cm和6cm两部分,则▱ABCD的周长为(  )

A.28cm

B.32cm

C.28cm或32cm

D.无法确定

题型:填空题

按“起杆”键栏杆机无反应,有可能栏杆机电源空开调闸。

题型:填空题

在农业生产中,在保“水肥等条件下,还要做到科学的播种(如合理密植),才能利于光合作用有效提高单位面积的产量.如图表示叶片在阳光下进行的生理活动,据图回答:

(1)若图中A表示二氧化碳,则C表示______,此过程表示植物进行的生理活动是______.B表示______.

(2)若A表示氧气,则此过程表示植物进行的生理活动是______.

(3)若C表示水,此时表示叶片正在进行的生理活动是______.

(4)叶片与外界进行A、C物质交换的窗口是______;

(5)种植农作物时科学播种非常重要,为了充分利用光能有效的提高单位面积的产量要做到______.

题型:填空题

Now let us look at how we read.When we read a printed text, our eyes move across a page in short, rough movement.We recognize words usually when our eyes are still when they fixate(凝视).Each time they fixate, we see a group of words.This is known as the recognition span or the visual span.The length of time of which the eyes stop ---the duration of the fixation ----varies considerably from person to person.It also varies within one person according to his purpose in reading and his familiarity with the text.Furthermore, it can be affected by such factors as lighting and tiredness.

Unfortunately, in the past, many reading improvement courses have concentrated too much on how our eyes move across the printed page.As a result of this misleading emphasis on the purely visual aspects of reading, numerous exercises have been devised to train the eyes to see more words at one fixation.For instance, in some exercises, words are flashed on to a screen for, say, a tenth or a twentieth of a second.One of the exercises has required students to fix their eyes on some central point, taking in the words on either side.Such word patterns are often constructed in the shape of rather steep pyramids so the reader takes in more and more words at each successive fixation.All these exercises are very clever, but it’s one thing to improve a person’s ability to see words and quite another thing to improve his ability to read a text efficiently.Reading requires the ability to understand the relationship between words.Consequently, for these reasons, many experts have now begun to question the usefulness of eye training, especially since any approach which trains a person to read isolated words and phrases would seem unlikely to help him in reading a continuous text.

59.The time of the recognition span can be affected by the following facts EXCEPT________ .

   A.one’s familiarity with the text B.one’s purpose in reading

   C.the length of a group of words       D.lighting and tiredness

60.The author may believe that reading ______.

   A.requires a reader to take in more words at each fixation   

B.requires a reader to see words more quickly

   C.demands a deeply-participating mind                   

D.demands more mind than eyes

61.What does the author mean by saying the underlined sentence in the second paragraph?

   A.The ability to see words is not needed when an efficient reading is conducted.

   B.The reading exercises mentioned can’t help to improve both the ability to see and to

comprehend words.

  C.The reading exercises mentioned can’t help to improve an efficient reading.

  D.The reading exercises mentioned have done a great job to improve one’s ability to see

words.

62.What is the writer’s attitude in writing this passage?

   A.critical   B.neutral   C.pessimistic     D.optimistic

题型:填空题

关系数据库中,实现表与表之间的联系是通过( )。

A.实体完整性规则
B.参照完整性规则
C.用户自定义的完整性
D.值域

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