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【单选题】
PLC的I/O点数是指_______。
【判断题】
I/O点数是选择PLC的重要依据之一。当系统的I/O点数不够时,必须重新需用其他型号的PLC。
【单选题】
I/O点数为256以上、2 048点以下属于()。
【单选题】
CPU226型PLC本机I/O点数为( )
【单选题】
CPU226型PLC本机I/O点数为( )
【判断题】
CPU224型PLC本机I/O点数为14/10。
【多选题】
输出总点数和功能,PLC一般大致分为_______。
【单选题】
PLC的输入和输出量有开关量和模拟量两种。开关量I/O用最大I/O点数表示,模拟量I/O点数用最大I/O通道数表示。 ( )
【单选题】
PLC的输入和输出量有开关量和模拟量两种。开关量I/O用最大I/O通道数表示,模拟量I/O点数用最大I/O点数表示。 ( )
【单选题】
PLC各I/O点的通断状态在面板上显示是通过____。
【单选题】
A ____ person is one who is easily hurt or offended by things that people do or say.
【单选题】
Don’ t forget to put the book back on the shelf, _____?
【单选题】
Beth could ____ her coat because it had large red buttons.
【单选题】
By no means_____ to our plan for the trip.
【单选题】
His mother had talked to him for two hours while he was
watching TV, but_____.
【单选题】
In this book the writer gives us a(n)____ picture of social
history.
【单选题】
Of course, most immigrants did not get rich
overnight, but the ____ of them were eventually able to improve upon their former standard of living.
【单选题】
China is ____ in natural resources.
【单选题】
Mr. Robinson knew that the most trivial chore could
prove to be a ____ if approached with enthusiasm.
【单选题】
When Ann broke the dish she tried to put the ____ back together.