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【简答题】
正常运行时定子绕组接成三角形的三相交流异步电动机,均可采用Y-△换接降压启动。启动时,定子绕组先接成( ),由于每相绕组的电压下降为正常工作电压的1/1.732 ,故启动电流下降为全压启动的( )。当转速接近额定转速时,电动机定子绕组改接成( ),进入正常运行。 接触器( )、( )用于Y接启动控制; 接触器( )、( )用于△接运行控制。
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【单选题】According to the passage, Hitler attempted to_____
A.
Change the pilots biologically to win the war．
B.
Develop genetic farming for food supply．
C.
Kill the people he thought of as inferior．
D.
Encourage the development of genetic weapons for the war
【单选题】The 'so-called fight-or-flight response' (Line 2, Para 1) refers to '______'.
A.
the biological process in which human beings' sense of self-defense evolves
B.
the instinctive fear human beings feel when faced with potential danger
C.
the act of evaluating a dangerous situation and making a quick decision
D.
the elaborate mechanism in the human brain for retrieving information
【简答题】阅读理解。 Among all the fast growing science and technology, the research of human genes, or biological engineering as people call it, is drawing more and more attention now. Sometimes it's a hot topic di...
【单选题】男性,50岁。因钝器击伤头部1h后入院。患者昏迷、呕吐,双侧瞳孔不等大。血压180/102mmHg。行硬膜下血肿清除术+碎骨片清除术,留置引流管送回病房。医嘱:250ml甘露醇快速滴入滴完的时间是:
A.
5min内
B.
30min内
C.
60min内
D.
90min内
E.
90min以上
【单选题】男性,50岁,因钝器击伤头部1h后入院。患者昏迷、呕吐,双侧瞳孔不等大。血压180/102mmHg。行硬脑膜下血肿清除术+骨碎片清除术,留置引流管回病房,术后引流管护理正确的措施是
A.
每天消毒引流管
B.
保持引流管通畅
C.
引流管脱出及时送入
D.
定时冲洗引流管
E.
每天更换引流管
【单选题】His dislike of the course may prove to be a(n) ______ barrier he cannot overcome.
A.
biological
B.
ideological
C.
spiritual
D.
psychological
【单选题】Among all the fast growing science and technology, the research of human genes, or biological engineering as people call it, is drawing more and more attention now. Sometimes it's a hot topic discusse...
A.
Gene technology and another treatment of the two diseases.
B.
The two murderers who killed the cloned baby.
C.
The two diseases of cancer and heart disease.
D.
Hereditary diseases and cancer.
【简答题】数据库系统中系统故障通常称为软故障,介质故障称为_____________。
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