主轴部件按运动方式可分为哪几类?

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问题:

主轴部件按运动方式可分为哪几类?

考点:机电设备评估基础第三章金属切削机床第三章金属切削机床题库
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阅读理解

      A long time ago people thought that the Sun went round the Earth. In

some countries people even said that the Sun was a god(神). They thought the god drove across the sky each day on a golden horse. Now we know the Earth goes round the Sun. It takes the Earth a year to go all way round the Sun.

Today man even know how far it is for the Earth to go round the Sun. They

tell us that the Earth travels over a thousand miles a minute on its journey

round the Sun. 

     The Sun is really a star. It is much bigger than the Earth and it is very hot. Some people have been to the moon but we know that no one can ever go to

the Sun. It is far too hot for people to live anywhere near it. The Sun is three hundred thousand times(倍)heavier than the Earth and more than 1 million

times larger.

1. A long time ago, people said the Sun was _____.

A. a golden horse of god    

B. a god on a golden horse

C. a god with golden dress    

D. a god and a golden horse

2. People can never live anywhere near the sun because it is _____.

A. too hot      

B. too far      

C. too small      

D. too heavier

3. The Earth travels over _____ miles an hour.

A. 1, 000    

B. 100, 000      

C. 6, 000, 000      

D. 60, 000

4. One year is _____.

A. the time for the Earth to turn round.    

B. the time the Earth travels one thousand miles.

C. the time the Earth goes round the Sun one circle(圈,周).  

D. the journey of the Earth.

5. Which of the following is TRUE? _____

A. The moon is the planet of the Sun.    

B. One day man can land on the Sun.

C. The Sun is a star like other stars.    

D. The moon is the nearest star to us in space.

题型:问答题 简答题

某施工单位(乙方)与某建设单位(甲方)签订了建造无线电发射试验基地施工合同。合同工期为38天。由于该项目急于投入使用,在合同中规定,工期每提前(或拖后)1天奖(罚)5 000元。乙方按时提交了施工方案和施工网络进度计划(见下图),并得到甲方代表的同意。

实际施工过程中发生了如下几项事件。

事件1:在房屋基槽开挖后,发现局部有软弱下卧层。按甲方代表指示,乙方配合地质复查,配合用工为10个工日。地质复查后,根据经甲方代表批准的地基处理方案,增加工程费用4万元,因地基复查和处理使房屋基础施工延长3天,人工窝工15个工日。

事件2:在发射塔基础施工时,因发射塔坐落位置的设计尺寸不当,甲方代表要求修改设计,拆除已施工的基础,重新定位施工。由此造成工程费用增加1.5万元,发射塔基础施工延长2天。

事件3:在房屋主体施工中,因施工机械故障,造成工人窝工8个工日,房屋主体施工延长2天。

事件4:在敷设电缆时,因乙方购买的电缆质量不合格,甲方代表令乙方重新购买合格电缆。由此造成敷设电缆施工延长4天,材料损失费1.2万元。

事件5:鉴于该工程工期较紧,乙方在房屋装修过程中采取了加快施工的技术措施,使房屋装修施工缩短3天,该项技术措施费为队0.9万元。

其余各项工作持续时间和费用均与原计划相符。

乙方可得到的工期补偿为()天。

A.3

B.4

C.5

D.6

题型:问答题 简答题

临床最常见的继发性高血压是

A.嗜铬细胞瘤

B.原发性醛固酮增多症

C.主动脉弓狭窄

D.肾血管性高血压

E.慢性肾脏疾病

题型:问答题 简答题

急性左心衰竭主要表现为()

A.发作性喘息

B.夜间阵发性呼吸困难

C.突发严重呼吸困难

D.进行性加重的呼吸困难

E.劳力性呼吸困难

题型:问答题 简答题

温热病,邪热内陷心包,症见高热烦躁,神昏谵语,痉厥,口渴唇焦,尿赤便秘者,治宜选用

A.安宫牛黄丸
B.紫雪
C.至宝丹
D.紫金锭
E.以上都不适宜

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