【单选题】患者男,78岁。因行髋关节置换术后3d,出现发热伴呼吸困难收入重症监护病房。进入ICU后,因患者呼吸窘迫伴严重低氧血症立即行气管插管,呼吸机辅助呼吸,气道内吸出大量黄脓痰。体格检查:烦躁不安,血压146/66mmHg,脉搏105/min,体温38.7℃。双肺广泛干湿啰音。腹部膨隆,肠鸣音弱。既往有高血压、糖尿病史。血常规:WBC16×10 9 /L,中性粒细胞0.88,血肌酐152μmol/L。经...
【单选题】( ) of polychlorinated biphenyl onto sea bed sediment and marine plankton was examined.
【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.
【简答题】多氯联苯(polychlorinated biphenyl,PCB):
【简答题】多氯联苯(polychlorinated biphenyls,PCB s )
【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。
【单选题】Why does the article refer to polychlorinated biphenyls?
A.
to give an example of a product thought to be harmless that was later found to be toxic
B.
to give an example of a product that has many uses
C.
to explain another new technology
D.
to give an example of a product created with nanomaterials
【判断题】一个新股东要想取得股利,必须在除权日之前购入股票,否则即使持有股票也无权领取股利。( )
【简答题】Polychlorinated have already been widely used to manufacture electronic circuit boards. (biphenyl / phenyl)
【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.