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【判断题】
三相异步电动机带额定负载时，效率最大。A.
正确
B.
错误
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【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 ...
A.
change
B.
cure
C.
demand
D.
set
【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.
【简答题】When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are. People who are near-sighted can only see things that ar...
【简答题】• What did he see at the north end of the park?
【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】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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