应《网络安全法》要求，自2017年10月1日起，未进行实名认证将不得使用互联网跟帖服务。为保障您的帐号能够正常使用，请尽快对帐号进行手机号验证，感谢您的理解与支持！

24小时热门版块排行榜    

小木虫论坛-学术科研互动平台 » 科研生活区 » English Cafe » Opinion » How abundant my day is!
212/3返回列表上一页123下一页
查看: 863  |  回复: 20
只看楼主 @他人 存档 新回复提醒 (忽略) 收藏    在APP中查看
本帖产生 1 个 ESEPI ，点击这里进行查看

nanohero

禁虫 (小有名气)
本帖内容被屏蔽
11楼2011-10-18 14:48:13
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

nanohero

禁虫 (小有名气)
本帖内容被屏蔽
12楼2011-10-18 14:51:01
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

585368yaya

铜虫 (小有名气)
引用回帖:
7楼: Originally posted by baigang at 2011-10-18 14:13:28:
i learn a new word : postgraduate

Your image r so cute~
赞一下 回复此楼
13楼2011-10-18 15:00:07
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

holypapa

木虫 (职业作家)
引用回帖:
4楼: Originally posted by mooncakexzj at 2011-10-18 14:03:14:
Everything can change in the blink of an eye

just as it was said by xiaoshenyang , with your eyes being openned and closed once ,in the blink of an eye,one day has passed. and with your eyes being closed and never openned again,that is  in the no  blink of an eye, a whole life has passed. So the blink of  an eye is very significant. please try to blink your eyes as often as possible and never stop.
赞一下 回复此楼
Aappleadaykeepsdoctoraway.
14楼2011-10-18 16:25:46
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

nanohero

禁虫 (小有名气)
本帖内容被屏蔽
15楼2011-10-18 17:24:19
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

nanohero

禁虫 (小有名气)
本帖内容被屏蔽
16楼2011-10-18 17:26:23
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

张冬凯-

铜虫 (小有名气)
The addition of nitrogen oxides and other sources of NO2 across the double bonds of alkenes is an important route to nitro compounds. Alkenes react with dinitrogen tetroxide in the presence of oxygen to form a mixture of vic-dinitro(a), β-nitro-nitrate ester (b) and β-nitro-nitrite ester(c) compounds; the nitrite ester being oxidized to the nitrate ester in the presence of excess dinitrogen tetroxide. A steam of oxygen gas is normally bubbled through the reaction mixture to expel nitrous oxide formed during the reaction and so prevent more complex being formed. These reactions can be synthetically useful for the synthesis of vic-dinitroalkanes because nitrate and nitrous ester by -products are chemically unstable and are readily hydrolyzed to the corresponding β-nitro alcohol on treatment with methanol.
        1,2-Dinitroethane and 1,2-dinitrocyclohexane can be formed in this way from corresponding alkenes in 42% and 37% yield respectively.
        the addition of dinitrogen tetroxide across the double bonds of electrons deficient fluorinated alkenes is a particularly useful route to  vic-dinitro compounds where yields are frequently high, tetrafluoroethylene gives a 53% yield of 1,2-dinitro-1,1,2,2-tetrafluoroethane.
赞一下 回复此楼
没有最牛逼，只有更牛逼
17楼2011-10-18 18:01:38
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zzyhyuan

木虫 (著名写手)
As we all know,it is so hard to find out what to eat in the university canteen.Everyday every-meals,and yes,not a bit change at all.
赞一下 回复此楼
原来爱本身可爱在于束缚
18楼2011-10-18 19:43:26
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

ljason
19楼2011-10-18 20:54:20
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

witch_girl

金虫 (文坛精英)
yes, it is.
回复此楼
Make it or Break it
20楼2011-10-18 22:37:42
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 nanohero 的主题更新
212/3返回列表上一页123下一页
普通表情 龙 兔 虎 猫 高级回复 (可上传附件)
信息提示
关闭
请填处理意见
关闭