由S7-200PLC和S7-300PLC构成的MPI通信网络中，200PLC只能作为从站，不能做主站。
查看答案
可以使用指令向导来完成S7-200PLC的网络读写指令编程。
A. 对
B. 错
The story is told from ______ point of view.
A. the author's
B. the father's
C. the child's
D. the doctor's
The boy's illness was _____.
A. headache
B. a cold
C. influenza
D. fever
We were still in bed and I saw he looked _____.
A. ill
B. illness
C. tiring
D. tiredness
微信支付 
支付宝支付