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问题 单项选择题

胜利油田四化建设中PLC与第三方仪表设备通讯要求采用（）协议。

A.MODBUS RTU

B.MODBUS ASCII

C.CAN

D.DEVICE NET

答案

参考答案：A

填空题

有定义boolean b1=5!=6；，则变量b1的值是【 】。
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填空题
请先阅读下面短文，掌握其大意，然后从方框所给的词中选出最恰当的，用其适当形式填空。
house, always, animal, home, they, can’t, parent, stay, well, run, kind, good
Many people like__66__. Children like animals__67__. Usually we can only see dogs, cats, ducks or chickens around us. We__68__see other animals such as elephants, tigers, pandas or monkeys. On Sunday, __69__often take__70__children to the zoo. How happy the children are! They__71__from one place to another. They give animals all__72__of good food to eat.
They__73__there hour after hour. They don’t want to go__74__. Children __75__have a good time in the zoo.
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