在多台电动机相互配合完成一定的工作时,电动机之间必须有一些约束关系,这在控制电路中称为()。
A、自锁
B、连锁
C、级联
D、顺序
参考答案:B
通用面向对象的变电站事件的缩略语是()
which of the following is the BEST tool for showing the team the project schedule status during project execution ?()
A.Milestone chart
B.Gantt chart
C.Work breakdown structure
D.Network diagram