化合物庚烷的主要用途是作为双基推进剂的增塑剂.The heptane compound has a primary purpose as a plasticizer for doublebase propellant systems.正庚烷异构化的难点在于高选择性地生成多侧链异庚烷和抑制异庚烷的裂化反应.However, it is difficult to produce multi branched i heptane and re...
They found volatilization of dieldrin tended to decrease as bulk density increased.他们发现狄氏剂的挥发常随紧实度的增加而减低.Dieldrin is related to aldrin, and its toxicity to earthworms is similar.狄氏剂与艾氏剂有关,对蚯蚓的毒性是相似的....
崖沙燕是一种褐羽白腹的鸟。The sand martin is a brown bird with white underneath.燕麦麸在去年成为保健狂人的最爱。Oat bran became the darling of health freaks last year.一燕不成夏.One swallow does not make a summer....
He felt that medicine was the most important cause to which he could dedicate himself.他觉得医学是他能够为之献身的最重大的事业.She vowed to herself that she would dedicate her life to scientific studies.她默默地发誓要献身于科学研究.President Lincoln came...