n. 酮类(ketone的复数)
n. any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals

ketones的用法和样例:

例句

  1. Progress in pinacol coupling of aldehydes and ketones using low valent titanium is reviewed in recent years.文章综述近几年来由低价钛还原偶联醛酮合成片呐醇的进展。
  2. The development in the oxidation of olefins to ketones catalyzed by palladium compounds was reviewed.本文系统地评述了钯配合物催化烯烃氧化合成酮类物质的研究进展。

ALLEN: Excuse me. Do you study Chinese at the university here? SUZY: Yes, I do. But my characters are very bad. ALLEN: It takes a long time to learn Chinese writing. SUZY: Are you Chinese? ALLEN: Yes, I am. I am from Taiwan. I came here to study pol

发表于:2018-11-28 / 阅读(789) / 评论(0) 分类 留学英语口语

[00:01.87]Three Peach Stones [00:05.04]Observe a child; any one will do. You will see that not a day passes in which [00:11.93]he does not find something or other to make him happy, [00:14.89]though he may be in tears the next moment. Then look at a

发表于:2018-11-30 / 阅读(735) / 评论(0) 分类 英语专业晨读美文

很轻快很耐听,歌词很可爱:Donna Lewis- I could be the one 成长于英国卡地夫威尔士市的Donna,早在6岁时她就开始接触和弹奏钢琴。启蒙老师即Donna的父亲还引导小Lewis学着创作自己的歌曲,而这时

发表于:2018-12-13 / 阅读(630) / 评论(0) 分类 英文手机铃声歌曲

Donna Lewis I Could Be The One I Could Be The One 倾我所有 I could be your sea of sand 我愿成为你宁静的港湾 I could be your warmth of desire 我愿成为你渴望的温暖 I could be your prayer of hope 我愿成为你希望的祈祷 I

发表于:2018-12-13 / 阅读(494) / 评论(0) 分类 英文好歌推荐-百听不厌的英文歌曲

A:Eric,how long will you be in china? Eric,.你要在中国呆多久? B:I don't know,Well my contract here is one year and I don't know what I should do after that.Maybe going around for a while. 不

发表于:2019-01-03 / 阅读(513) / 评论(0) 分类 英语抢先学

SYDNEY: All molecules are not created equal. Some have saved billions of lives, wreaked environmental havoc or made the world a more colorful place. Here's our selection of those that have changed the course of human history。 发自悉尼:分子并

发表于:2019-01-08 / 阅读(564) / 评论(0) 分类 实用英语

有句话说的好:云中谁寄锦书来,相知何必曾相见。 《北京遇上西雅图2》其实它的副标题《不二情书》才是正片片名。这次女神不再是文青拜金女,摇身一变风情万种个性飒爽的赌场公关;吴

发表于:2019-01-08 / 阅读(516) / 评论(0) 分类 英美文化

Michael Johns - Heart On My Sleeve You think you've heard this before I'll try and say it differently As long as it comes naturally to me It's been makin' me sad 'Cause I can't find a better way To speak the words I want to say to you Know I love you

发表于:2019-01-10 / 阅读(484) / 评论(0) 分类 好听的英文歌曲

英文歌词: Well I told you once and I told you twice But ya never listen to my advice You don't try very hard to please me With what you know it should be easy Well this could be the last time This could be the last time Maybe the last time I don't

发表于:2019-01-10 / 阅读(496) / 评论(0) 分类 英文摇滚歌曲

A billion people died on the news tonight But not so many cried at the terrible sight Well mama said It's just make believe You can't believe everything you see So baby close your eyes to the lullabies On the news tonight Who's the one to decide that

发表于:2019-01-11 / 阅读(492) / 评论(0) 分类 美国乡村音乐

Aishwarya Rai Bachchan is one of Indias best known and best loved actresses. She was born in 1973 and was a very bright pupil at school. She worked part-time as a model while studying architecture. She planned to be an architect. Things changed all o

发表于:2019-01-11 / 阅读(458) / 评论(0) 分类 世界名人简介

[00:00.00] MODULE 9 Mistakes Unit 1 What's the matter? [00:10.95]Activity 1.Listen and point.Sam:What's the matter? [00:26.72]Why are you laughing?Daming:We're going to have a baseball team. [00:31.06]Sam:So why is that funny?Why are you laughing? [0

发表于:2019-01-15 / 阅读(722) / 评论(0) 分类 北外版新标准小学英语第六册(三年级起点)

The Blue Box 蓝盒子 The ultimate combination of pranks and electronicsand the escapade that helped to create Applewas launched one Sunday afternoon when Wozniak read an article in Esquire that his mother had left for him on the kitchen table. 恶作

发表于:2019-01-22 / 阅读(536) / 评论(0) 分类 乔布斯传

A new survey shows you're not paying any more the gas pumped than you were three weeks ago. Good news since late May. Motorists aren't paying any more for gas, but not paying any less either, accordin

发表于:2019-01-26 / 阅读(515) / 评论(0) 分类 商业报道2006年

唐顿庄园第二季第二集_6 [INT. DINING ROOM - EVENING] VIOLET, DOWAGER COUNTESS OF GRANTHAM I gather your footman Thomas has returned to the village. No. [Violet refuses the sauce Lang offers.] ROBERT, EARL OF GRANTHAM Crikey. Where did you se

发表于:2019-01-28 / 阅读(550) / 评论(0) 分类 唐顿庄园第二季

I Could Be The One (倾我所有) I could be your sea of sand (我愿成为你宁静的港湾) I could be your warmth of desire (我愿成为你温暖的庇护) I could be your prayer of hope (我愿成为你希望的祈祷) I could be your gift to everyday (我愿是你每一天

发表于:2019-02-08 / 阅读(550) / 评论(0) 分类 音乐咖啡厅

OK, I'm going to talk about my one wish. I think everybody has one or two things they wish they could change about themselves and for me I really wish I could sing. Unfortunately I have a terrible voice. I cannot sing at all, and in Japan, this is ve

发表于:2019-02-20 / 阅读(471) / 评论(0) 分类 实战口语情景对话

Todd: OK. Cat, we're back. We're gonna talk about things you can do. Cat: OK. Todd: Can you cook? Cat: Not really! Todd: No! Cat: Well, I can, but not very well. Todd: OK. What do you do for dinner? Cat: Buy take-away food. Todd: OK. When you buy tak

发表于:2019-02-21 / 阅读(465) / 评论(0) 分类 英语趣味课堂

OK, I'm going to talk about my one wish. I think everybody has one or two things they wish they could change about themselves and for me I really wish I could sing. Unfortunately I have a terrible voice. I cannot sing at all, and in Japan, this is ve

发表于:2019-02-25 / 阅读(531) / 评论(0) 分类 英语访谈对话

OK, I'm going to talk about my one wish. I think everybody has one or two things they wish they could change about themselves and for me I really wish I could sing. Unfortunately I have a terrible voice. I cannot sing at all, and in Japan, this is ve

发表于:2019-03-06 / 阅读(735) / 评论(0) 分类 英语趣味课堂
学英语单词
a good guy
acinar gland
acropoma hanedai
ADMT
air bumper
air-spaced paper insulation
amending statute
amreeta
Ardgour
Arthrochin
bar turret lathe
battery manganese
be confident that
bootlicking
breedons
car-alarm
casing shroud
centrifuge waste system
clippership
concept of accounting control
concurrent input/output
dam shoulder
De Lancey, James
direct drive gear
disconcordance
disk colter arm
eigi
electrolyse
elementary and secondary
flattening reducer
fluoracyl chloride
fluorophen
ganocephala
gauffered fabric
genetic resources
geobiochemical circulation
geometric seismology
gripper die
ground test vehicle
ground-wire
Halesia carolina
hard nuts to crack
heavy passing shower
high energy nuclear magnetic resonance detector
horse hay press
hoti
hydremic ascites
hyperbolized
in one breath
incremental testing
intercarrier television
iridocinesis
jersey chaser
krabacher
law of independent assortment
leoninely
limited wars
linearity (of a detector)
linking group
longitudinal time code
low-frequency power measurement
machiolated
Maiskhāl I.
meditullium
megaheroes
mirliton
msdos.sys
multivariable variants
nonsolid colours
Off Peak Power
performance testing station
pointers
polyactin
Porro-Koppe principle
preconvention
prep stall
primolut N
priority algorithm
qorei
readiness record
registered ballot
resonance test
San Caprasio
secalt
simplificator
smon
snake tube
stereographer
sunk costs
switching-impulse sparkover voltage
thimble punch holder
tongster
totally-enclosed machine
umbrella-back chair
universal chain
unsaturated state
upper-triangular matrix
vibration galvanometer
volatile inhibitor
warbird
Welsh rabbits
without demur