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【判断题】
压疮指局部组织长期受压、血液循环障碍，持续缺血、缺氧、营养不良而致的组织溃烂坏死，又称为压力性溃疡。()A.
正确
B.
错误
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【单选题】What did the North of the United States begin to develop in the nineteenth century?
A.
Industry and business
B.
Technology and transportation
C.
Agriculture and forestry
D.
Manufacture and handicraft
【判断题】非周期、连续时间信号具有连续、非周期频谱； 周期、连续时间信号具有离散、非周期频谱； 非周期、离散时间信号具有连续、周期频谱； 周期、离散时间信号具有离散。周期频谱； 可见，信号的时域周期性对应频域的连续性，时域连续性对应频域的周期性。
A.
正确
B.
错误
【单选题】What did North and South Korea launch on Tuesday?
A.
The Korean War.
B.
An agreement.
C.
A conflict.
D.
Family reunions.
【单选题】What did the researchers at Duke University in North Carolina say?
A.
Humans need more sleep than other mammals.
B.
Humans need less sleep than other mammals.
C.
Humans need as much sleep as other mammals.
D.
Humans have developed sleeping habits recently.
【单选题】What did scientists working in the North Pole claim a few years ago?
A.
In many land areas spring snowmelt is advanced year by year.
B.
The north polar cap has thinned by 2 percent in the last decade.
C.
Dramatic changes in the pattern of ice distribution have taken place in the North Pole.
D.
The temperature of the tundra below the Arctic Circle has dramatically dropped.
【单选题】Singing Alarms Could Save the Blind If you cannot see, you may not be able to find your way out of a burning building-and that could be fatal. A company in Leeds could(51)all that with directional (定向...
A.
change
B.
cure
C.
demand
D.
set
【单选题】What did scientists claim several months after Gore returned from the North Pole?
A.
In many land areas spring snowmelt is advanced year by year.
B.
The north polar cap has thinned by 2 percent in the last decade.
C.
Dramatic changes in the pattern of ice distribution have taken place in the North Pole.
D.
The temperature of the tundra below the Arctic Circle has dramatically dropped.
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