以正庚醛 、 硫代硫酸钠和溴代正丁烷为原料,合成了正庚醛正丁硫醇缩醛.The heptanal butyl mercaptan was synthesized with heptanal, sodium thiosulfate and 1 bromobutane as raw materials.目的研究以庚醛和原甲酸三乙酯为原料制备庚醛二乙缩醛的工艺条件.Aim Enanthal diethyl acetal is prepared ...
测量扁率是极为困难的.Determining the oblateness is extremely difficult.详细计算分析了地球扁率对最优轨道的影响.The changes of optimal trajectory caused by Earth's oblateness are computed.这个椭球面通常以它的长半轴和短半轴或者长半轴和扁率定义.The ellipsoid is defined by it...
防治葫芦科植物萎蔫病,至今仍依靠使用化学药剂防治甲虫.The control of cucurbit wilt has been based on chemical insecticides applied for beetle control.香瓜属葫芦科, 一年蔓生草本植物.Cantaloup is belonged to cucurbitaceous, a year of rampant herb.你认为葫芦科植物最显著的特点是 ...
He smiled, an odd, dreamy smile that sent chills up my back.他笑了，笑容古怪迷离，叫我后背发凉。How odd life was, how unfathomable, how profoundly unjust.生活多么离奇，多么莫测，多么不公啊！Her Irish accent, after thirty-odd years in London, is undiluted.她...
The hardware were mainly made of the SCM, CP , infrared communication interface, alarm annunciation, power supply and so on.硬件主要由单片机 、 PC机 、 红外通信接口 、 预警指示 、 电源等构成.Radial distances from CP or CL are too short.从投影中心或投影中线的辐...
His face matched his body, and was lean, almost cadaverous.他的身子和脸很相配, 瘦得象骷髅.By degrees the freshest among them began to cadaverous and saucer - eyed.原先脸色顶鲜明的人,现在也都渐渐变得面无人色,两只眼睛也都显得眍了.He had a cadaverous face.他面如死灰....