问题 单项选择题

牙槽龈组纤维()

A.纤维起于牙槽嵴顶,呈放射状向牙冠方向走行

B.自牙颈部牙骨质,向牙冠方向散开,广泛地位

C.自牙槽嵴向冠方牙龈固有层展开,止于游离龈

D.起自根分叉处的牙根间骨隔顶,至根分叉区牙

E.自牙颈部的牙骨质,越过牙槽嵴,止于牙槽突

答案

参考答案:B

问答题

Discussion of the assimilation of Puerto Ricans (波多黎各人 ) in the United States has focused on two factors: social standing and the loss of national culture. In general, excessive stress is placed on one factor or the other, depending on whether the commentator is North American or Puerto Rican. Many North American social scientists, such as Oscar Handlin, Joseph Fitzpatrick, and Oscar Lewis, consider Puerto Ricans as the most recent in a long line of ethnic entrants to occupy the lowest rung on the social ladder. (46) Such a " socio demographic" approach tends to regard assimilation as a benign process, taking for granted increased economic advantage and inevitable cultural integration, in a supposedly egalitarian context. However, this approach fails to take into account the colonial nature of the Puerto Rican case, with this group, unlike their European predecessors, coming from a nation politically subordinated to the United States. (47) Even the "radical" critiques of this mainstream research model, such as the critique developed in Divided Society, attach the issue of ethnic assimilation too mechanically to factors of economic and social mobility and are thus unable to illuminate the cultural subordination of Puerto Ricans as a colonial minority.

In contrast, the "colonialist" approach of island based writers such as Eduardo Seda- Bonilla, Manuel Maldonado-Denis, and Luis Nieves-Falcon tends to view assimilation as the forced loss of national culture in an unequal contest with imposed foreign values. There is, of course, a p tradition of cultural accommodation among other Puerto Rican thinkers. The writings of Eugenio Fernandez Mendez clearly exemplify this tradition, and many supporters of Puerto Rico’s commonwealth status share the same universalizing orientation. (48) But the Puerto Rican intellectuals who have written most about the assimilation process in the United States all advance cultural nationalist views, advocating the preservation of minority cultural distinctions and rejecting what they see as the submission of colonial nationalities.

This cultural and political emphasis is appropriate, but the colonialist thinkers misdirect it, overlooking the class relations at work in both Puerto Rican and North American history. They pose the clash of national cultures as an absolute polarity, with each culture understood as static and undifferentiated. (49) Yet both the Puerto Rican and North American traditions have been subject to constant challenge from cultural forces within their own societies, forces that may move toward each other in ways that cannot be written off as mere "assimilation. " Consider, for example, the indigenous and Afro-Caribbean traditions in Puerto Rican culture and how they influence and are influenced by other Caribbean cultures and Black cultures in the United States. (50) The elements of compulsion and inequality, so central to cultural contact according to the colonialist framework play no role in this kind of convergence of racially and ethnically different elements of the same social class.

(48) But the Puerto Rican intellectuals who have written most about the assimilation process in the United States all advance cultural nationalist views, advocating the preservation of minority cultural distinctions and rejecting what they see as the submission of colonial nationalities.

问答题 案例分析题

某安装公司承包一演艺中心的空调工程,演艺中心地处江边(距离江边100m),空调工程设备材料:双工况冷水机组(650Rt)、蓄冰槽、江水热源泵机组、燃气锅炉、低噪声冷却塔(650t/h)、板式热交换机、水泵、空调箱、风机盘管、各类阀门(DN20~DN700)公称压力1.6MPa、空调水管(DN20~DN700)、风管、风阀及配件(卡箍、法兰)等由安装公司订立采购合同。

安装公司项目部进场后,针对工程中采用的新设备、新技术编制了施工方案,方案中突出了施工程序和施工方法,并明确了施工方法的内容。江水热源泵机组利用江水冷却,需敷设DN700冷却水管至江边,DN700冷却水管道的敷设路径上正好有一排千年古树,方案中选择非开挖顶管技术,并分包给A专业公司施工。空调水管需化学清洗并镀膜,分包给B专业公司施工。安装公司向专业公司提供了相关资料,负责现场的管理工作,确保专业公司按批准的施工方案进行施工。

按施工进度计划,安装公司项目部及时与供货厂商联系,使设备材料运到的现场时间与施工进度配合,以满足施工进度要求。设备材料到达施工现场,按规定对设备材料进行检验,其中对阀门重点检验。空调工程按施工程序实施。空调设备安装后,进行管道、风管及配件安装调试,空调工程按要求完工。

本工程要编制哪几个新技术的施工方案?方案中的施工方法应有哪些主要内容?