The directionality of written English is from left to right.英文的书写方向是自左至右.It has the nature of randomness , generality, problem solving , radiativeness, directionality and creativity.它具有随机性 、 概括性 、 问题性、辐射性、指向性和创造性.The the...
a cryogenic storage system低温冷藏系统Trapping gas pump include: adsorption, such as pumps and cryogenic pumps.气体捕集泵包括: 吸附泵和低温泵等.Foamed plastic materials containing many small cells which are not connected are good cryogenic i...