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【单选题】
对称三相电路,负载作星形连接,负载的电压为380V,是线电压为( )A.
220V
B.
380V
C.
660V
D.
440V
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皮皮学刷刷变学霸
举一反三
【单选题】引起流行性角结膜炎的病原体是
A.
腺病毒 8 、 19 、 29
B.
腺病毒 3 、 4 、 7
C.
70 型肠道病毒
D.
单纯疱疹病毒
E.
A24 柯萨奇病毒
【单选题】People in the United States in the nineteenth century were haunted by the prospect that unprecedented change in the nation's economy would bring social chaos. In the years following 1820 after several...
A.
The economic development of the United States in the eighteenth century.
B.
Ways in which economic development led to social changes in the United States.
C.
Population growth in the western United States.
D.
The increasing availability of industrial jobs for women in the United States.
【简答题】The first pilgrims settled in the United States in
【单选题】People in the United States in the nineteenth century were haunted by the prospect that unprecedented change in the nation' s economy would bring about social chaos.
A.
occupied
B.
overwhelmed
C.
obliged
D.
obsessed
【单选题】In the United States in 1986, the average rate of violent crime in states with strict gun-control laws was 645 crimes per 100,000 persons—about 50 percent higher than the average rate in the eleven st...
A.
The annual rate of violent crime in states with strict gun-control laws has decreased since the passage of those laws.
B.
In states with strict gun-control laws, few individuals are prosecuted for violating such laws.
C.
In states without strict gun-control laws, many individuals have had no formal training in the use of firearms.
D.
The annual rate of nonviolent crime is lower in states with strict gun-control laws than in states without such laws.
E.
Less than half of the individuals who reside in states without strict gun-control laws own a gun.
【简答题】When Franklin D. Roosevelt was elected President of the United States in 1932, not only the United States but also the rest of the world was in the throes of an economic depression. Following the term...
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