【简答题】A.She is one of the best babysitters in the area B.She purchases groceries for evening meals. C.She provides special educational entertainment. D.She does some housework while the parents are out.
【简答题】She was surprised to find all these CDs and she picked one up and sat down on the bed and she started to open one.
【单选题】下列对PLC输入继电器的描述正确的是:
C.
输入继电器的线圈既可以由外部信号来驱动又可以由程序来驱动
【简答题】如何为出院患者进行健康指导?有患者要出院啦!菜鸟球指教