带电作业工具的电气试验和机械试验的周期是多少?

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问题:

带电作业工具的电气试验和机械试验的周期是多少?

考点:国家电网线路安规考试国家电网线路安规考试题库
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在X线摄影中,X线束是以焦点作为顶点的锥形放射线束,将被照体G置于焦点与胶片之间时,因为几何投影关系,一般被照体离开焦点一定的距离a(焦-肢距),胶片离开肢体一定的距离b(肢-片距)。所以,肢体在X线胶片上的影像S要比肢体G大,是被放大了的影像,S与G之比即影像的放大率M,而且胶片离肢体越远,影像放得越大。国际放射学界公认:当照片上的半影模糊值<0.2mm时,人眼观察影像毫无模糊之感;当半影模糊值=0.2mm时,人眼观察影像开始有模糊之感。故0.2mm的半影模糊值就是模糊阈值。

关于M=1+b/a,叙述正确的是()

A.M表示放大率

B.a表示肢-片距

C.b表示焦-片距

D.影像放大对像质的影响大于变形

E.放大对成像是有害的

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Today just as technology changed the face of industry, farmers have undergone an "agricultural revolution". On the farm of today, machines provide all the power.

One of the most important benefits will be the farm computer. A few forward-looking farmers are already using computers to help them run their farms more efficiently. The computers help them keep more accurate records so they can make better decisions on what crops to plant, how much livestock to buy, when to sell their products, and how much profit they can expect. Many computer companies have been developing special computer programs just for farmers. Programs are being written for hog(猪) producers, grain farmers, potato farmers, and dairy farmers. In the future, farmers will be able to purchase computer programs made to their needs. Because of the growing importance of computers on the farm, students at agricultural colleges are required to take computer classes in addition to their normal agricultural courses. There can be no doubt that farmers will rely on computers even more in the future. While the old-time farm depended on horse power, and modern farms depend on machine power, farms of the future will depend on computer power.

Another technological advance which is still in the experimental stage is the robot, a real "mechanized hired hand" that will be able to move and, in some ways, think like a human being. Unlike farmers of the present, farmers of the future will find that many day-to-day tasks will be done for them. Scientists are now developing robots that will be able to shear(修剪) sheep, drive tractors, and harvest fruit. Even complex jobs will be done by robots. For example, in order to milk their cows, farmers must first drive them into the special barn(畜棚), then connect them to the milking machines, watch the machines, and disconnect them when they are finished. In the future, this will all be done by robots. In addition, when the milking is completed, the robots will automatically check to make sure that the milk is pure. The complete mobilization of the farm is far in the future, but engineers expect that some robots will be used before long.

小题1:Which sentence carries the main idea of the whole passage? 

A.The first sentence of the first paragraph.

B.The first sentence of the second paragraph.

C.The first sentence of the third paragraph.

D.The last sentence of the second paragraph.小题2:Which of the following statements is true?  

A.Farmers in the future will depend totally on computers.

B.Both computers and robots have been in use on today's farms.

C.Farmers mainly use machines on their farms at present.

D.Farmers can do nothing without the help of computers on today's farms.小题3: According to the engineers,_____________ will be done by robots in the near future.

A.all farm work

B.milking cows

C.most of the farm work

D.some house work小题4:What is the best title for the passage?

A.Computer—Farmers' Best Friend

B.Farmers in the Future

C.Robots in the future

D.Revolution on the farm

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服务部重瓶的工作要求?

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资料1

辽宁宁海工程有限公司(2101240111)在投资总额内进口工程用设备(法定计量单位:台)。在设备进口前,向主管海关办理了进出口货物征免税证明(海关签注的征免性质为“鼓励项目”)。货物委托辽宁外贸集团公司(2101910011)与外商签约并代理进口,货物到港后由大连海通货运有限公司(2102980111)代理进口报关。

全程运保费港币20000元。入境货物通关单(代码:A)号:44210010303330

资料2:

请根据以上资料,填制进口报关单以下栏目:

“经营单位”栏应填()。

A.辽宁宁海工程有限公司2101240111

B.辽宁外贸集团公司2101910011

C.辽宁宁海工程有限公司

D.大连海通货运有限公司

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开通系统在定单监控可以通过下面()条件进行查询。

A.工单标识

B.工单编码

C.业务号码

D.定单编码

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