活性中心,有效中心

active centre的用法和样例:

例句

  1. The production of polymer in each case involves the rapid addition of monomer to a few active centres.在各种情况下聚合物的生成都是单体对少数几个活性中心的快速加成。

[00:35.00]a/an [00:37.07]art.1.一(个) 2.任何一个 3.每,每一 [00:39.13]abandon [00:40.59]vt.1.抛弃 [00:42.06]abide [00:43.49]2.放弃. [00:44.93]ability [00:46.37]v.(by)坚持,遵守 [00:47.80]able [00:49.18]n.1.能力,智能 2.才能,才干

发表于:2018-11-30 / 阅读(188) / 评论(0) 分类 考研英语词汇2005

actually 实际上 accident 意外 act 行动 active 积极 activity 活动

发表于:2018-12-01 / 阅读(196) / 评论(0) 分类 用听的背单词-基础2000MP3(a-g)

Today's topic is active voice versus passive voice. Here's Brian from Iowa: It drives me crazy when people write in passive voice. How can I teach people how to tell the difference between passive and active voice and stay away from passive voice? Th

发表于:2018-12-07 / 阅读(151) / 评论(0) 分类 英语语法 Grammar Girl

Unit 2 She looks active. [00:02.39]第二单元 她看起来活跃。 [00:04.78]Lesson 7 Just speak [00:07.01]第七课 刚才的谈话 [00:09.25]Who's this? [00:10.83]这个是谁? [00:12.41]My new friend in the art club. [00:14.29]我在艺术俱乐

发表于:2018-12-12 / 阅读(163) / 评论(0) 分类 人教版小学英语五年级

by Mignon Fogarty Today's topic is active voice versus passive voice. The podcast edition of this article was sponsored by GoToMeeting. With this meeting service, you can hold your meetings over the Internet and give presentations, product demos and

发表于:2018-12-15 / 阅读(150) / 评论(0) 分类 英语语法 Grammar Girl

Muslim Brotherhood Ready for More Active Role in Jordan From VOA Learning English, this is IN THE NEWS in Special English. The Muslim Brotherhood is one of the largest Islamic groups in the Arab world. For years, the Brotherhood has been banned in a

发表于:2018-12-16 / 阅读(125) / 评论(0) 分类 2013年VOA慢速英语(六)月

The top American military officer, Admiral Mike Mullen, has taken a particularly active role in changing the U.S. approach to Afghanistan, contributing to the new strategy, choosing the new commander for U.S. and NATO forces, and deciding to replace

发表于:2018-12-16 / 阅读(106) / 评论(0) 分类 VOA标准英语2009年(六月)

Iranian President Mahmoud Ahmadinejad's visit to Istanbul last week is seen as part of Ankara's increasingly active role in the Middle East, after decades of passivity in the region. At the same time, some analysts say, Turkey's ties to the West are

发表于:2019-01-13 / 阅读(172) / 评论(0) 分类 VOA标准英语2008年(八月)

World Health Day Focuses On 'Active Aging' Shelby Harris just celebrated his 111th birthday. His secret? I try to live the right kind of life, he said. I try to live the truth, I love everybody and I want everybody to love me. Some experts say a posi

发表于:2019-01-13 / 阅读(142) / 评论(0) 分类 VOA标准英语2012年(四月)

Active MRI Shows How Joints Work 活动核磁共振成像显示身体关节如何运作 Since its introduction in the 1980s, magnetic resonance imaging machines, commonly known as MRI scanners, have become a highly valuable tool in diagnostic medicin

发表于:2019-01-14 / 阅读(150) / 评论(0) 分类 VOA标准英语2014年(三月)

LONDON, July 4 (Xinhua) -- Anders Fogh Rasmussen, Secretary General of the North Atlantic Treaty Organization (NATO) expressed his hope on Wednesday that NATO would seek a more active dialogue with China. We must expand the range of nations with whom

发表于:2019-01-30 / 阅读(201) / 评论(0) 分类 英语新闻

SEOUL, Nov. 8 (Xinhua) -- Samsung Electronics, the world's largest flat screen TV vendor, said Tuesday that it has suspended its plan to develop active shutter three-dimensional (3D) TVs with RealD, the U.S.-based 3D technology supplier. Samsung has

发表于:2019-01-30 / 阅读(174) / 评论(0) 分类 英语新闻

Yesterday the Sir Edmund Hillary Outdoor Pursuits Centre (OPC) was fined by a court for unsafe practices which caused the death of seven people last year. See January 22nd 2009 Six students and a teacher from Elim Christian College were killed while

发表于:2019-02-04 / 阅读(156) / 评论(0) 分类 新西兰英语

今天我们要学的词是active duty。 Active duty, 现役的。星期一是美国阵亡将士纪念日。 My friend Jack is an active duty Army Captain who has deployed overseas three times, 我朋友杰克是现役陆军上尉,先后三次被派

发表于:2019-02-05 / 阅读(166) / 评论(0) 分类 英语每日一词

今天我们要学的词是active duty。 Active duty, 现役的。星期一是美国阵亡将士纪念日。 My friend Jack is an active duty Army Captain who has deployed overseas three times, 我朋友杰克是现役陆军上尉,先后三次被派

发表于:2019-02-16 / 阅读(123) / 评论(0) 分类 英语单词荟萃

On April 15th 2008, New Zealand experienced a terrible tragedy: 6 teenagers and a teacher died while on an outdoor education activity in the centre of the North Island. (See April 17th 2008 on this website.) They were canyoning in the Mangatepopo Gor

发表于:2019-02-18 / 阅读(134) / 评论(0) 分类 新西兰英语

Voice 1 Welcome to Spotlight. I'm Mike Procter. Voice 2 And I'm Nick Page. Spotlight uses a special English method of broadcasting. It is easier for people to understand, no matter where in the world they live. Voice 1 Hezron thinks it is fun to race

发表于:2019-02-21 / 阅读(154) / 评论(0) 分类 环球英语 Spotlight
学英语单词
Acme Commodity and Phrase Code
acrazing
acx
agricultural soil moisture characteristics
air dry cell
alans
alkanasul
all-ceramic crown
Anglo-German
anti-beriberi vitamin
aquomethemoglobin
Aster cordifolius
Automatic Identification and Data Capture
autoregressive coefficient
barely not
barentsite
barrameda
bear-shaped lamp
bin shift
bleached brown loam
block automation system
bryden
Bureya
canaloplasties
category iii condition
character loan
chlorine metasomatism
cholers
compartment ceiling
computer-networking
consistantly
constructed price
copper-oxide detector
cross track
croupous pneumonia
earhart
electromagnetic irradiation
encylopedias
ex ante investment
f-g
fourth-wall
fresh water inlet manifold
gas-bags
Guy Fawkes Night
Hammurabi
handing out
ill-conditioned
immune to all pleas
incorporated pocket-books
infantile kala-azar
interhaemal arch
irresistible
Ivinheima
Japan Radio Company
job-hunt
lithostratigraphically
marmalade plums
measuring transmitter
methanol crossover
Monro's abscesses
nonpriming material detonator
offshore field
one-to-one function, one-to-one mapping
optical time standard
optime
Orgametril
oviducal pouch
patriality
periodic crystal lattice
physiologic pH
pickled fish
pit bull
polarity of ground
Port Gamble
pottwal
Protoastrakhanite
publishly
reaggregates
runway (rwy)
sambrook
schecter
sea-lawyer
simaite
sneaky
speaking tour
spinneys
spy in the cab
sticked
sucking root
sulphurflowers
system validation
tailism
target-towing vessel
terry swatch
TM (maximum temperature)
tobacco stems
trephination and irrigation
true reversion
valiancy
vapour stream
volatile oil reservoir
yakka