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【单选题】
化学致癌物的致癌作用不具有下列哪一特点( )A.
剂量越大,肿瘤发生率越高
B.
潜伏期长
C.
致癌是一个多阶段的复杂过程
D.
某些化学致癌物仅起激发作用
E.
同一种化学致癌物只引起某种组织肿瘤
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【单选题】听力原文： What was the most popular mix about the United States in the 19th Century was that of the free and simple life of the farmer. It was said that the farmers worked hard on their own land to produc...
A.
Jefferson's views about commercialized agriculture.
B.
International trade in the nineteenth century.
C.
Improvements in farm machinery in the United States.
D.
Farmers' loss of independence.
【判断题】although the united states has produced most commercial films in the 20th century, movies did not originate in america. ()
A.
正确
B.
错误
【简答题】工程质量控制的统计分析方法有哪几种?
【简答题】某设备监理机构在进行石化装置项目监理过程中，对已经施工完成的主体结构组织了质量检查，对混凝土构件尺寸质量检查的实测实量结果如下。 在全部检查的8个项目中不合格点(超偏差限值)有150个(见表4-8)。为改进并保证质量，应对这些不合格点进行分析；以便找出混凝土构件尺寸的薄弱环节。 问题： 1．画出混凝土构件尺寸的薄弱环节的排列图。 2．找出造成质量问题的薄弱环节。 3．数据采集的抽样方法有哪几种?，...
【单选题】Immigration to the United States by people with shorter average height is no reason for the decline in the average height in America because______.
A.
Asians came to the United States only in recent years
B.
Asians are taller than immigrants from other areas
C.
the immigration by people with shorter average height is not large enough
D.
immigrants of other ethnicities usually have good access to medical care and nutrition
【简答题】在网页上为一个学校的开学典礼插入一个宣传海报
【单选题】What does the passage mainly discuss?
A.
The economic development of the United States in the nineteenth century.
B.
Ways in which economic development led to social changes in the United Slates.
C.
Population growth in the western United States.
D.
The increasing availability of industrial jobs for women in the United States.
【单选题】Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centers of (144) cri...
A.
eruption
B.
corruption
C.
interruption
D.
provocation
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