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【单选题】
饱和度取决于可见光谱中光的( )。A.
波长
B.
反射率
C.
纯净度
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举一反三
【单选题】No sooner had I closed the door than somebody started knocking ______ it.
A.
on
B.
with
C.
to
D.
for
【单选题】Mary had no sooner finished her report ________ the bell rang.
A.
when
B.
and
C.
as
D.
than
【单选题】Mary had no sooner finished her report______the bell rang.
A.
When
B.
and
C.
as
D.
than
【单选题】Mary had no sooner finished her report ____________ the bell rang.
A.
when
B.
and
C.
than
D.
as
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