As an electric controlled element, electronic expansion valves have many advantages which traditional heat expansion valves don't have, such as high precision, and fast and correct action.
作为电控元件，电子膨胀阀具有传统的热力膨胀阀所不具备的精度高，动作快速且准确的优点。
2
As a guide element of urban expansion and the urban structure framework, road traffic has a complicated relation with spatial form evolution of old cities.
作为城市拓展导向要素以及城市结构骨架的道路交通，与旧城空间形态演变之间存在复杂的关系。
3
To solve this problem, the nonlinear finite element calculation in parallel with model tests are used to study the expansion water seal, and a modified program is identified accordingly.