We create five attributes: a unique identifier, three persistent data members, and a non-persistent ( transient) data member. 我们创建了五个属性:一个唯一标识、三个持久数据成员和一个非持久(暂时)数据成员。
Simulation of transient flow field and dynamic characteristics of pressure reducing valve during start-up Can a Manual Machine pass a Pearl to an Automatic Machine before a team member has pressed the Automatic Machine's start button? 减压器开启过程内部流场的动态仿真和特性研究在一个队员按下自动机器人的启动键前,是否允许手动机器人将一个珍珠交给自动机器人?