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【多选题】
关于对流换热,说法正确的是_____。A.
对流换热的快慢与物体表面形状和尺寸有关
B.
水自然对流换热的表面传热系数比空气的小
C.
水沸腾换热比无相变时的换热慢
D.
对流换热是热对流和导热两种传热方式共同作用的结果
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【单选题】Before the discovery of insulin, diabetic patients was treated by
A.
electric shock
B.
strict diets
C.
penicillin
D.
prontosil
【简答题】阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出最佳选项。 In 1883, a creative engineer, John Roebling, was inspired to build a splendid bridge connecting New York with Long Island. However, experts throughout the world thou...
【单选题】We can learn from para. 2 that
A.
a dozen of blood examples were from the patients died between 1986 and 1989.
B.
Dr. Arien studied the blood examples to find the cause of AIDS.
C.
the subtype of virus involved is different due to different places.
D.
3/4 of the viruses appeared to be more harmful than before.
【简答题】Only experts with a professional eve can tell the fine(fair,pleasant,subtle) distinction between the two gems.
【简答题】Years can pass before the unwanted effects of a drug are discovered and, even then, they may occur in a tiny fraction of patients.
【单选题】Which one is right for the patients with nonheritable retinoblastoma?
A.
The patients often have family history of retinoblastoma.
B.
The patients often get retinoblastoma before 8months.
C.
The patients can increased risk for other tumors.
D.
Mutations happen in germile.
【判断题】Before the discovery of insulin, diabetic patients was cured by strict diets.
A.
正确
B.
错误
【单选题】Before the patients recover from the anaesthetic, they often need an _____ to help them breathe.
A.
IV infusion
B.
oxygen mask
C.
ice pack
【单选题】Directions: In this section, you will hear three short passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After y...
A.
Lack of electricity.
B.
Shortage of books.
C.
Lack of clean water.
D.
Shortage of experts.
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