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【单选题】
肺泡 I型细胞的特征哪项错误A.
肺泡表面大部分由 Ⅰ型细胞覆盖
B.
细胞为扁平形，胞质极薄
C.
胞质内含有吞入微尘和表面活性物质形成的小泡
D.
Ⅰ型细胞有自我增殖分裂能力
E.
相邻的上皮细胞间有紧密连接
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举一反三
【简答题】Why does
the professor mention teeth?A. As a good source of
Vitamin D B. As an additional example
of bones. C. As a place in the body
where Vitamin D is converted D. As something that does
not get muc...
【单选题】What important point does the professor make about the area where the rocks are found?
A.
It has been the site of Earth's highest wind speeds.
B.
It is subject to laws that restrict experimentation.
C.
It is accessible to heavy machinery.
D.
It is not subject to significant changes in temperature.
【单选题】What does the professor mean where says this:
A.
Results are tragic when airplanes strike birds.
B.
Sightings of birds from aircraft are unusual.
C.
Airplanes do not frighten away most birds.
D.
There is little similarity between birds and jets.
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