问题
单项选择题
当用户所需的输入输出点数或类型超出主机上输入输出单元所允许的点数或类型时，最好的解决方法是（）。
A.软件
B.改造PLC的微处理器
C.加接输入输出扩展机
D.另外再买一台
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
当用户所需的输入输出点数或类型超出主机上输入输出单元所允许的点数或类型时，最好的解决方法是（）。
A.软件
B.改造PLC的微处理器
C.加接输入输出扩展机
D.另外再买一台
参考答案：C
Mr. Johnson is a bank clerk. 26______ wife, Mrs. Johnson, is a shop assistant. Mr. Johnson and Mrs. Johnson have 27________ sons, Jack and Tom.. Jack and Tom are very 28_______. They don’t like to 29________ their mom do the housework. One day, Mr. Johnson goes back home from a long journey (旅行). He buys a 30________ for his sons. Jack and Tom both like the toy and they 31____ it. Mr. Johnson says to his sons, “ I want to 32_____ the toy to the best boy. 33____ helps your mom clean the room? It’s you, Jack 34_____ it’s you, Tom?” The two brothers say to their ______, “ You can give the toy to yourself, Dad.”
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