简述前端RTU、PLC与上位机通讯协议。

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问题:

简述前端RTU、PLC与上位机通讯协议。

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急性腹膜炎术后腹腔安置引流管的护理,下列正确的是()

A.术后6h后接通引流管

B.妥善固定

C.保持引流通畅

D.观察引流液性状

E.记录出入量

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From their beginnings New England towns had a special democratic system of government. At a stated time all the citizens would assemble at a town meeting, where they would discuss local problems and express opinions freely. They also elected the town’s officials at these gatherings and made decisions about the taxes they would pay and about other community matters. These meetings were usually held at the town hall, which was located in the central square.

In the eighteenth-century town meetings, only men who owned property and who were church members actually voted, although everyone present was allowed to express their opinions. Later, all citizens were allowed to vote. Thus the town meeting became truly democratic. Town meetings are still common in New England communities.

In recent years the town meeting idea has been widely imitated. There are open sessions of this kind on radio and television. Occasionally a meeting of this type is called by a government agency in order to give an opportunity for free and open discussion on current problems and policies.

小题1:At a town meeting, people do the following things EXCEPT __________. 

A.express their opinions about the government

B.elect officials of the towns

C.make a decision about whom they should marry

D.discuss some community matters小题2:In the 18th century, who had the right to vote?  

A.All the citizens.

B.All the men except those who were church members.

C.The rich.

D.The rich men and the church members.小题3:Why has the town meeting been widely imitated? 

A.Because many people are interested in it.

B.Because it is very democratic.

C.Because many people enjoy themselves at town meetings.

D.Because sometimes government agencies call them.小题4:According to the passage, which of the following statements is NOT true? 

A.Citizens can elect the officials in the town meeting.

B.In recent years, town meetings are often called by a government agency.

C.People can say what they want to say at the town meeting.

D.Nowadays this kind of meeting is also held on radio and television.小题5:This passage mainly talks about _______.  

A.the New England town meeting

B.modern town meetings

C.a democratic meeting

D.New England towns

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肥煤就是肥沃的地区出产的煤。()

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使用线性回归等式:Y15.8+1.1X得到以下表格。 X实际值Y预测值Y实际值残差015.810-5.8 116.9181.1 218.0279.0 319.1211.9 420.214-6.2 对存在问题的最佳描述是()。

A.存在自相关 

B.存在非线性关系 

C.数据是不相关的 

D.数据为反向关系

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钻杆或钻铤的长度丈量准确后,必须用醒目的()将其()和()工整地写在本体上。

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