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当前学科：送电线路初级工
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基础的作用是什么？送电线路对基础有哪些要求？
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根据下列短文，回答题。 There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional system．In a market system individual economic units are free to interact among each other in themarketplace．It is possible to buy commodities from other economic units or sell commodities tothem．In a market，transactions may take place via barter or money exchange．In a barter economy，real goods such as automobiles，shoes and pizzas are traded against each other．Obviously，finding somebody who wants to bade my old Car in exchange for a sailboat may not always bean easy task．Hence，the introduction of money as a medium of exchange eases transactions considerably．In the modern market economy，goods and services are bought or sold for money． An alternative to the market system is administrative control by some agency over all trans．actions．This agency will issue edicts or commands as to how much of each good and service should be produced，exchanged，and consumed by each economic unit．Central 01anaing may be one way of administering such an economy．The central plan，drawn up by the government,shows the amounts of each commodity produced by the various firms and allocated to differenthouseholds for consumption．This is an example of complete planing of production，consump—tion，and exchange for the whole economy． In a traditional society，production and consumption paUerns are governed by tradition：everyperson’S place within the economic system is fixed by parentage，religion and custom． Transac—tions take place on the basis of tradition，too．People belonging to a certain group or caste mayhave an obligation to care for other persons，provide them with food and shelter，care for theirhealth，and provide for their education．Clearly，in a system where every decision is made on thebasis of tradition alone，progress may be difficult to achieve．A stagnant society may result．What is main purpose of the passage?
下列各种引流管，不正确的处理是（）
影响四氮唑盐比色法的因素有（）
在粘贴式木楼地面施工时，应先在钢筋混凝土结构层用15mm厚（）水泥砂浆找平。
基于规则的方法就是在邮件标题和邮件内容中寻找特定的模式，其优点是规则可以共享，因此它的推广性很强。
甲乙两国在其交界处发现一处跨国界的油气田，两国谈判共同开发未果。当甲国在其境内对该油田独自进行开发时，乙国派军队进入甲国该地区，引发了两国间的大规模武装冲突。甲国是1949年日内瓦四个公约的缔约国，乙国不是。根据国际法的有关规则，下列判断何者为错误?
压力控制回路
企业如有以（）建造固定资产，其成本应当按照直接材料、直接人工、直接机械施工费等计量。
根据GB／T19001-2008标准7.6条款，组织有可能会对以往测量结果的有效性进行评价
三相异步电动机铭牌的功率因数值是指（）。