精梳准备工艺流程采用偶数道数可使喂入精梳机的小卷中后弯钩较多。

题型:判断题

问题:

精梳准备工艺流程采用偶数道数可使喂入精梳机的小卷中后弯钩较多。

考点:纺纱工艺纺纱工艺题库
题型:判断题

56÷7=8,表示56里面有(    )个(    );还表示把(    )平均分成7份,每份是(    )。

题型:判断题
对的画“√”,错的画“×”并改正。
(1)35×(40+16)             改正:
      =35×40+35
  
(2)99×101               改正:
      =99×(100-1)
      =99×100-99
题型:判断题

阅读理解。

     The Chinese-born American architect Ieoh Ming Pei is one of the most creative architects of our times.

He has incorporated both eastern and western ideas into his designs.

     Ieoh Ming Pei was born in Guangzhou, China on April 26, 1917. His father was a famous banker. In 1935,

at the age of 17, he came to the United States to study architecture at Massachusetts Institute of Technology.

In 1942, he entered the Harvard Graduate School of Design.

     In 1964, Jacqueline Kennedy selected Pei to design the Kennedy library. After that he became well-known

all of the world. People named it one of the Ten Best Buildings in the United States. In 1968, Pei started work

on the East Wing of the National Gallery of Art, in Washington D.C.. Over one million people visited the

building during its first 50 days in existence.

     Following the East Wing project Pei's fame has continued to grow widely. In 1983, French President

commissioned (委任) Pei to help make the Louvre more modern. Ten years later, the completion of Pei's glass

pyramid at the Louvre created a new historic landmark for Paris. Pei described it as, "the greatest challenge

and greatest accomplishment of my career." At Fragrant Hill, a 300-room hotel in the Chinese capital, Pei has

attempted to bring to his native China his often-quoted "third way of making buildings." Avoiding both a

complete copying of traditional Chinese motifs (特色) as well as the modernism of the West, Pei has managed,

at Fragrant Hill, to make one of his most eloquent (有说服力的) statements.

     Pei has designed nearly 50 projects in the United States and abroad. About half of these projects have won

major awards. Pei has been awarded the highest honors from nations over the world. In 1990, Pei was

awarded the Medal of Freedom by President George Bush for his contributions to world peace and service to

the US government.

1. Which is the right order of the events of Ieoh Ming Pei?

    a. Pei started work on the East Wing of the National Gallery of Art, in Washington DC.

    b. Ieoh Ming Pei entered the Harvard Graduate School of Design.

    c. The completion of Pei's glass pyramid at the Louvre created a new historic landmark for Paris.

    d. Ieoh Ming Pei was selected to design the Kennedy library.

    e. Ieoh Ming Pei was born in Guangzhou.

    f. Pei was awarded the Medal of Freedom by President George Bush.

    g. Ieoh Ming Pei came to Massachusetts Institute of Technology.

    h. French President commissioned Pei to help make the Louvre more modern. [ ]

A. e-g-d-b-a-h-c-f

B. e-g-b-d-a-h-c-f

C. e-g-b-d-h-a-c-f

D. e-g-b-d-a-h-f-c

2. The underlined word "incorporate" can be replaced by _____. [ ]

A. divide

B. combine

C. separate

D. part

3. It was _____ that Ieoh Ming Pei became world-famous. [ ]

A. after the completion of Pei's glass pyramid at the Louvre

B. after he designed East Wing of the National Gallery of Art, in Washington DC

C. after he designed the Kennedy library

D. after he designed the Fragrant Hill

4. _____ is an excellent building that shows both the traditional Chinese motifs and the modernism of the West. [ ]

A. Fragrant Hill

B. Pei's glass pyramid at the Louvre

C. The East Wing of the National Gallery of Art

D. Kennedy library

5. We can infer that about _____ of Ieoh Ming Pei's projects have won major awards.[ ]

A. 50

B. 15

C. 25

D. 35

题型:判断题

锅炉使用品质不良的水会造成哪些危害?

题型:判断题

某同学探究外界条件对H2O2分解速率的影响,所用H2O2浓度为5%、10%,实验温度为20℃、40℃,其他试剂有1mol/LFeCl3溶液.每次实验H2O2的用量为2mL,FeCl3溶液2滴.

(1)请完成以下实验设计表:

实验编号温度/℃H2O2浓度/%其它试剂实验目的
205(Ⅰ)实验①和②探究催化剂对H2O2分解速率的影响;

(Ⅱ)实验②和③探究温度对该反应速率的影响;

(Ⅲ)实验②和④探究H2O2浓度对该反应速率的影响.

205FeCl3溶液
__________________
__________________
(2)实验④产生气泡的速率比实验②快.分析引起反应速率差异的原因是______.

(3)废旧印刷电路板的回收利用可实现资源再生.经粉碎分离,能得到非金属粉末和金属粉末.用H2O2和H2SO4的混合溶液可溶出印刷电路板金属粉末中的铜,溶液变成蓝色,写出发生反应的化学方程式:______.

控制其它条件相同,印刷电路板的金属粉末用10%H2O2和3.0mol/LH2SO4溶液处理,测得不同温度下铜的平均溶解速率(见下表)

温度(℃)20304050607080
铜的平均溶解速率

(×10-3mol/(L•min))

7.348.019.257.987.246.735.76
当温度高于40℃时,铜的平均溶解速率随着反应温度的升高而下降,其主要原因是:______.

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