2. When
designing the program relate to a database, the operation is necessary that adding data, deleting data, updating data and querying data.
设计与数据库相关的程序时,实现对数据库记录的添加、删除、更新和查询等操作是不可避免的。
3. The addendum coefficient is an important parameter in the
designing the gear, and to affect the discharge characteristic of compound gear pump.
齿顶高系数是设计齿轮时的重要几何参数,也是影响复合齿轮泵流量特性的重要参数之一。