This paper advances the preparation method of erucamide by direct ammonolysis of rape oil. sol - vent crystallization.本研究提出菜籽油直接氨解、溶剂脱脂、蒸馏预分离、溶剂结晶提纯制取芥酸酰胺的方法....
起出通井管柱,检查通井规擦痕.Pull out the drifting string and check the gauge for scratch.但下放前要通井,不易过快,下放到预定位置时必须有一套管接箍缝,具承上压能力小.When the bridge plug comes to desired position, there must be a casing coupling seam.广泛应用于油田用修井机 、 通井机及其它...
the bottomless pit of his sorrow他无尽的悲哀He who can suppress a moment's anger may prevent a day of sorrow.能忍一时气，可免一日优。She was portioned with sorrow throughout her life.她命中注定一辈子受苦。I had dared and baffled his fury; I mus...
His persistent attempts to complain to his superiors were blocked and ignored.他一再试图向上级投诉，但都被挡了回来并置之不理。His superiors suspended him, and then downgraded him.他的上司先将他暂时停职，随后把他降职。I am accountable to my superiors for my action...