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形状复杂的零件毛坯(如壳体)应选用()
In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words(1)which we become acquainted in daily conversation, which we(2),that is to say, from the(3) of our own family and from our familiar associates, and(4) we should know and use (5 )we could not read or write. They (6) the common things of life, and are the stock in trade of all who (7) the language. Such words may be called“popular”, since they belong to the people (8) and are not the exclusive (9) of a limited class. On the other hand, our language (10) a multitude of words which are comparatively (11) used in ordinary conversation. Their meanings are known to every educated person, but there is little (12) to use them at home or in the market-place. Our (13) acquaintance with them comes not from our mother's (14) or from the talk of our school-mates, (15) from books that we read, lectures that we (16) ,or the more (17)conversation of highly educated speakers who are discussing some particular (18) n a style appropriately elevated above the habitual(19) f everyday life. Such words are called“learned”, and the (20) between them and the“popular”words is of great importance to a right understanding of linguistic process. 请在13处填上正确答案()
《铁路技术管理规程》(高速铁路部分)防护网安装完毕,打开车门后,由列车长组织()值守,直到车门关闭。
安装在烟囱顶上的避雷针直径不应小于下列数值()
从税负活动的三个环节来理解税负归宿的概念。
下列选项中,属于直接引起坠落的客观危险元素的情形有( )。
下列骨折类型中,最不稳定的是()
男性患者,30岁。确诊哮喘入院治疗3周,经正规治疗后病情缓解,仅偶有胸闷,患者应严禁用下述哪种药物( )。
原发性骨肿瘤的发生率为()。
什么是驳船?如何分类?
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ASME锅炉及压力容器规范第Ⅺ卷验收标准包括:()
ASME锅炉及压力容器规范第V卷A分册是:()
在锅炉及压力容器中使用热强钢,主要应具有哪些性能要求?()
锅炉压力容器宜用什么焊条()
关于锅炉压力容器安全管理,正确的有()。
制造锅炉用的法规、标准有:《蒸汽锅炉安全技术监察规程》、《热水锅炉安全技术监察规程》、《锅炉压力容器安全监察暂行条例》和《压力容器安全技术监察规程》。
DL612-1996《电力工业锅炉压力容器监察规程》规定:压力容器耐压试验其周期为()至少一次。
《锅炉压力容器使用登记办法》规定:压力容器的(),使用单位应当向登记机关申请变更登记。
《锅炉压力容器使用登记办法》规定:压力容器的(),使用单位应当向登记机关申请变更登记。
锅炉压力容器用钢的含碳量一般不超过0.25%。