[简答题]离心式压缩机的性能参数主要有哪些？-我要搜题网

[单项选择]The Nature of Civilizations During the Cold War the world was divided into the First, Second and Third Worlds. Those divisions are no longer relevant. It is far more meaningful now to group countries not in terms of their political or economic systems or in terms of their level of economic development but rather in terms of their culture and civilization. What do we mean when we talk of a civilization A civilization is a cultural entity. Villages, regions, ethnic groups, nationalities, religious groups, all have distinct cultures at different levels of cultural heterogeneity. The culture of a village in southern Italy may be different from that of a village in northern Italy, but both will share in a common Italian culture that distinguishes them from German villages. European communities, in turn, will share cultural features that distinguish them form Arab or Chinese communities. Arabs, Chinese and Westerners, however, are not part of any broader cultural entity. They constitute civilizations. A civilization is thus the highest cultural grouping of people and the broadest level of cultural identity people have short of that which distinguishes humans form other species. It is defined both by common objective elements, such as language, history, religion, customs, institutions, and by the subjective self-identification of people. People can and do redefine their identities and, as a result, the composition and boundaries of civilizations change. Civilizations may involve a large number of people, as with China("a civilization pretending to be a state," as Lucian Pye put it), or a very small number of people, such as the Anglophone Caribbean. A civilization may include several nation states, as is the case with Western, Latin American and Arab civilizations, or only one, as is the case with Japanese civilization. Civilizations obviously blend and overlay, and may include sub civilizations. Western civilization has two major variants, European and North American, and Islam has its Arab, Turkic and Malay subdivisions. Civilizations are nonetheless meaningful entities, and while the lines between them are seldom sharp, they are real. Civilizations are dynamic; they rise and fall; they divide and merge. And, as any student of history knows, civilizations disappear and are buried in the sands of time. Westerners tend to think of nation states as the principal actors in global affairs. They have been that, however, for only a few centuries. The broader reaches of human history have been the history of civilizations. In A Study of History, Arnold Toynbee identified 21 major civilizations; only six of them exist in the contemporary world.The author states that a civilization is______.
A. a cultural entity
B. a custom practiced in villages, regions, ethnic groups, nationalities, or religious groups
C. not with any cultural heterogeneity
D. not blending or overlapping with other civilizations

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[单选题]模板结构受压构件的长细比:支架立柱及桁架,不应大于( )。
A. 100
B.200
C.150
D.300

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[单选题]Y,d11接线的变压器，Y型侧线电压带后对应d型侧线电压角度差是(　　)。
A.330°
B.30°（）
C.300°（）
D.60°

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[单选题]用于直接接触触电事故防护时,应选用一般型剩余电流保护器,其额定剩余动作电流不超过( )。
A.10m
B.20m
C.30m

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[单选题]AFTN收发电地址中区域管制部门的三字代码是（）。
A.ZPZ
B.ZQZ
C.ZRZ
D.ZTZ

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[单项选择]为防止药物对胃的刺激或控制药物在肠道内定位释放，可制成包衣片的片剂是（）
A. 肠溶片
B. 分散片
C. 泡腾片
D. 舌下片
E. 缓释片

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[判断题]电缆在铁路站场内敷设，保护管应伸出铁路路基两侧各0.5m。（）
A.正确
B.错误