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【单选题】
非离子表面活性剂的HLB值是( )。A.
0-40
B.
0-20
C.
0-15
D.
0-10
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皮皮学刷刷变学霸
举一反三
【单选题】Why does the professor mention fossils?
A.
To describe the evidence Wegener used to develop his theory.
B.
To suggest that Wegener borrowed ideas from earlier scientists.
C.
To explain how Wegener first became interested in geology.
D.
To show why most scientists ridiculed Wegener's theory.
【单选题】Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.
A.
to
B.
for
C.
in
D.
from
【单选题】Why does the author mention Florence Nightingale?
A.
To describe the career of a pioneer of nursing education.
B.
To show that women doctors supported the effort to upgrade nursing.
C.
To prove that conditions differed in military and civilian hospitals.
D.
To show the similarity of her means to those used by United States reformers.
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