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【简答题】
若某质量的SO 2 与某质量的SO 3 中，含有等质量的氧元素，则SO 2 与SO 3 的质量比是 ______．相等质量的SO 2 和SO 3 中所含氧元素的质量比是 ______．
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皮皮学刷刷变学霸
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.
【单选题】Where does professor Kelly Stevens work?
A.
a) Tokyo University
B.
b) the University of Washington
C.
c) Cambridge University
D.
d) Cairo University
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