A new type gemini surfactant was synthesized from 1,4 - butanediol , maleic anhydride and 1 - octadecanol.采用1,4- 丁二醇 、 马来酸酐及十八醇为主要原料,合成出一种双子表面活性剂1, 4- 丁二醇双琥珀酸十八醇双酯磺酸钠.The catalysis of big pore strong acid resin for 1, 4 ...
Kinetin was later shown to be inhibitory for embryoid formation.激动素原来被表明抑制胚状体的形成.Exogenous applications of indoleacetic acid, kinetin or gibberellic acid stimulate photosynthesis.吲哚乙酸, 激动素或赤霉酸的外源施用刺激了光合作用....
演奏钢琴的戴夫将这支曲子反复弹了两三遍。Dave, the pianist, played it over a couple of times.钢琴的弹奏声混杂着低低的交谈声。The piano music mixes with the murmur of conversation.布洛基小姐弹钢琴的时候发挥了她的最好水平。Miss Blockey was at her best when she played the piano....
Students in fifty schools are to act as guinea pigs for these new teaching methods.五十所学校的学生将作为这些新教学法的试验对象。Objective To investigate the enzymatic debridement effect of bromelain ointment on guinea pigs with third - degree...