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____推力球轴承有和之分,装配时要注意区分’的内环的内,与轴配 合有间隙,能与轴相对静止’紧环与轴取较紧的配合,与軸相对运动.A.
正确
B.
错误
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【单选题】( ) of polychlorinated biphenyl onto sea bed sediment and marine plankton was examined.
A.
absorbent
B.
absorption
C.
adsorbent
D.
adsorption
【单选题】Polychlorinated biphenyls (PCBs) are organic compounds that were once used in industrial products such as paints and adhesives. However, open use of PCBs has been banned since 1970s, when it became cl...
A.
Because they contaminate soil.
B.
Because they contribute to global warming.
C.
Because they break down very slowly.
D.
Because they degrade organic matter.
【单选题】2006年1月,胡锦涛在全国科学技术大会上阐述了建设创新型国家的指导方针,即( )
A.
自主创新
B.
自主创新、重点跨越
C.
自主创新、重点跨越、支撑发展
D.
自主创新、重点跨越、支撑发展、引领未来
【简答题】BPR的核心内容包括清除非增值活动、 必要活动、任务整合、过程任务自动化。
【简答题】Polychlorinated have already been widely used to manufacture electronic circuit boards. (biphenyl / phenyl)
【单选题】2006年1月9日，胡锦涛在全国科学技术大会上的讲话指出，走中国特色自主创新道路，核心就是
A.
把增强自主创新能力作为发展科学技术的战略基点、推动科学技术的跨越式发展
B.
坚持自主创新、重点跨越、支撑发展、引领未来的指导方针
C.
把增强自主创新能力作为调整产业结构、转变增长方式的中心环节，建设资源节约型、环境友好型社会，推动国民经济又快又好发展
D.
把增强自主创新能力作为国家战略，不断巩固和发展中国特色社会主义伟大事业
【单选题】What are the potential risks of nanomaterials?
A.
There are so many products being created that it is hard to track them.
B.
Nanomaterials are so small that they cannot be seen by the human eye.
C.
The small size of nanomaterials may allow them to interfere with biological mechanisms.
D.
Nanomaterials are similar in structure to polychlorinated biphenyls.
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