As he talked, an airforce jet screamed over the town.他谈话时，一架军用喷气式飞机在镇子上空呼啸而过。Workers at the plant build the F-16 jet fighter.这个工厂的工人建造F-16喷气式战斗机。The company laid off 65,000 workers after commercial-jet orders dried up.商务...
During alcoholic fermentation acetaldehyde acts as a hydrogen acceptor instead of oxygen.在这个过程中乙醛取代了氧作为氢的受体.Decanoyl acetaldehyde was extracted from houttuynia cordata thunb by the method of solvent extraction process.利用...