Based on the reactions , this paper reports research for synthesizing benzaldehyde.简要介绍以此类方法对合成苯甲醛的研究.Natural benzaldehyde is prepared by hydrolysis cassia leaf oil.从桂叶油出发,通过碱性水解制备天然苯甲醛.Pitch resin was synthesized from b...
中国有世界最古老的树种 -- 水杉.China has the world's most ancient tree species -- metasequoia.采用正交试验方法,确立了徽波法提取水杉黄酮的提取工艺条件.The extraction technology of flavonoid in Metasequoia microwavean orthogonal test was studied.2005年7月25日,...
France's Champagne region, for instance, helps give Veuve Clicquot special cachet.例如法国香槟区就给[凯歌皇牌]特别的尊贵象徵.Veuve Clicquot is then carefully shipped around the world to discerning customers.尤乌·克里括香槟然后被小心地运往世界各地,供富于鉴赏力的...
绝经是自然的生理过程, 并非医学疾病.Menopause is a natural biological process, not a medical illness.但绝经后随着雌激素含量的降低, 27HC取而代之的与受体结合.But as estrogen declines after menopause, 27 HC takes over.绝经年龄是评价妇女更年期特征的主要指标.Menopausal age is an index...
The density logger consists of a radiation source.密度测井仪包括辐射源.Radiation effects relevant to this formalism are additive.和这套公式有关的辐射效应是可以相加的.The radioactive material is stored in a special radiation-proof container.放射性材料储存在...
大西洋上空的低气压通常给英国带来恶劣的天气.A depression over the Atlantic usually brings bad weather in Britain.图3.6.1热带低气压在二零零六年九月十二日至十三日的路径图.Figure 3.6.1 Track of the tropical depression on 12 - 13 September 2006.该低气压预计将于今日某个时候升级到热带风暴的强度.T...