《数控机床编程与操作》(数控程序员)试题库.pdf
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1、san asked me how I liked the party. She asked me if I had got her bag. 定语从句(非限定性和限定性) : 他买了那条我为他挑选的裤子. 这是她住的屋子. 去年加入我们的设计员工作很努力. 反意疑问句:doesnt she; shall we; did you. 看到/听到/感觉到某事正在发生: 我看到她上了公共汽车。I saw her getting on the bus. 动词-ing 形式和动词不定式 to do: 下面哪句对,哪句错? (对;错;错.) 表示义务/责任/不允许/不必的 have to, must 和 b
2、e allowed to, mustnt, dont have to 的用法: 选词填空:must; have to; mustnt; dont have to. 介词词组 in spite of, apart from 和 except for: In spite of; Except for. 对对方的说法表示同感 neither, nor, noteither, so: I dont smoke, neither does he. Tim has lost his camera, so has Mary. 日积月累: 短语动词:be worried about, give up, be
3、fed up with, get on with, look after, look for, agree with, pick out, write out, help sb with sth, apply for, be patient with, be interested in. 表示方位的短语:on the right/left, at the back/front, in the middle, top right, bottom left. 表示否定意义的前缀:un- im- in- dis- 开放英语(2)作业 3 一部分:1A 2B 3A 4B 5A 二部分:6C 7A 8C
4、 9A 10A 11A 12C 13B 14B 15B 16C 17A 18B 19C 20B 21B 22B 23C 24A 25B 三部分:26.He stole the laptop.(改为被动语态) The laptop was stolen by him. 27.Tim didnt go to work the next day. He cleaned up the flat.(用 instead of 将两句合成一句) Tim cleaned up the flat the next day instead of going to work. 28.“I cant find my
5、notebook,” she said.(改为间接引语) She said that she couldnt find her notebook. 29.It was a place. He wanted to go there.(用 where 将两句合成一句) It was a place where he wanted to go. 30.Tim has lost his camera. I have lost my camera.(用 so 将两句合成一句) Tim has lost his camera, so have I. 四部分:31.A 32.B 33.C 34.B 35.A
6、 36.B 37.A 38.A 39.B 40.A 五部分:41.我昨天让人把窗户擦了 42.他过去常每到星期天去打篮球 43.他们在晚会上玩得很开心 44.她不喜欢游泳,她妹妹也一样 45.三年来我一直在学英语 开放英语(2)期末自测 一部分:1B 2B 3A 4A 5A 二部分:6A 7C 8C 9B 10B 11A 12C 13A 14A 15C 16A 17B 18A 19C 20C 21A 22A 23C 24A 25B 三部分:26.I was too hot. I couldnt open the window.(用 but 将两句连成一句) I was too hot, but
7、 I couldnt open the window. 27. Although it rained, the visit was a success.(用 In spite of 将两句连成一句) The visit was a success in spite of rain. 28. Im tall and thin. My mother is too.(用 so 将两句连成一句) Im tall and thin, so is my mother. 29. They are going to look after the cat.(用 What 针对 the cat 改写句子) Wha
8、t are they going to look after? 30.He disturbed the burglars.(用被动语态改写句子) The burglars were disturbed by him. 四部分:31.B 32.B 33.A 34.B 35.A 36.B 37.A 38.B 39.A 40.B 五部分:41.他在北京西部的一个大学学习 42.他在他朋友的屋子里偶然看到了一幅旧油画 43.如果她赢了彩票,她将会买一间大房子 44.这间公寓有点儿乱 45.这两个男孩都擅长于唱歌 arXiv:astro-ph/0405405v1 20 May 2004 Neutral
9、Hydrogen in Arp 158 Mansie G. Iyer and Caroline E. Simpson Department of Physics, Florida International University, Miami, Fl 33199 miyer01fiu.edu, simpsoncfiu.edu Stephen T. Gottesman Department of Astronomy, University of Florida, Gainesville, FL 32611 gottastro.ufl.edu and Benjamin K. Malphrus De
10、partment of Physical Sciences, Morehead State University, Morehead, KY 40351 b.malphrusmorehead-st.edu ABSTRACT We present 21 cm observations of Arp 158. We have performed a study of the neutral hydrogen (Hi) to help us understand the overall formation and evolution of this system. This is a disturb
11、ed system with distinct optical knots connected by a linear structure embedded in luminous material. There is also a diff use spray to the southeast. The Hi seems to be made up of three distinct, kinematically separate systems. Arp 158 bears a certain optical resemblance to NGC 520 (Arp 157), which
12、has been identifi ed as a mid- stage merger. From our 21 cm observations of Arp 158, we also see a comparable Hi content with NGC 520. These similarities suggest that Arp 158 is also an intermediate stage merger. Subject headings: galaxies: interacting individual galaxy (Arp 158) ISM: Hi 1.INTRODUCT
13、ION In the early seventies, Toomre (1970) and Toomre the third knot is located approximately in the center of the linear structure. The westernmost “nucleus” was examined by Chincarini Clark 1980) to reduce the eff ect of the sidelobes produced by non-gaussian features of the synthesized beam (the “
14、dirty” beam). We tested various weighting schemes (robust parameter in the IMAGR task in AIPS) during the imaging process to increase the resolution, but because of the lack of baselines less than 1k, the increase in resolution was not worth the corresponding decrease in sensitivity. The higher reso
15、lution images did not reveal any new morphological or kinematic features, and with the lowered sensitivity, low column density features were lost completely. Hence, in order to maximize the sensitivity to low surface brightness features, we used the natural weighting scheme, resulting in a beamsize
16、(FWHM) of 47.3 42.2 . The data cube was cleaned down to 0.98 mJy per beam, corresponding to 1 as determined by the statistical analysis of a signal-free channel map. Line emission signal was present in channels from 41 to 89, approximately 4500 km s1to 5000 km s1, which were then integrated to produ
17、ce moment maps representing the Hi integrated column density (0th moment), the temperature-weighted mean velocity (1st moment), 4 and the velocity dispersion (2nd moment). 3.Results 3.1.Hi Spatial Distribution, Column Densities and Masses Throughout this paper we use a value of H0equal to 75 km s1Mp
18、c1and a heliocentric velocity of 4758 km s1( NASA IPAC Extragalactic Database, NED2) for Arp 158. These values imply a distance of 63 Mpc. The results from the derived quantities are shown in Table 3, and are discussed below. Figure 2 is a grayscale image of the Hi integrated fl ux density. We can s
19、ee that there are three distinct Hi concentrations which we denote as A, B, and C. Figure 3 represents the optical image from the second generation blue Digitized Sky Survey (DSS2)3overlaid with Hi contours. The central optical knot is more easily visible in this image. For the entire distribution,
20、we have detected a total Hi mass of 6.5 109M. System A, which has the highest beam-smoothed Hi column density (NHI= 13.0 1020atoms cm2) coincides with the optical knot system and seems to be centered to the west of the western knot/star. System B (NHI= 7.4 1020atoms cm2 ) appears to coincide with th
21、e diff use tail to the south-east. There is also a very interesting gas knot to the north-west of the galaxy. This is system C (NHI= 1.2 1020 atoms cm2 ). Note that the fi eld of view for Arps image (Figure 1) does not include this area. Although this system is faint in Hi it does appear in four con
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