皮皮学，免费搜题
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【单选题】
气体弹簧是以( )做弹性介质。A.
氮气
B.
氧气
C.
空气
D.
混合气
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Can fish hear fisherman__ along the stream?
A.
moved
B.
to move
C.
moving
D.
be moved
【简答题】A. To hear a translation of her talk. B. To hear signals produced by electric fish. C. To hear sounds used to train electric fish. D. To hear a recording about electric fish.
【单选题】"A _ fisher named Fisher failed to fish any fish on Friday" is the tongue twister we learnt.
A.
finnish
B.
Finnish
C.
Fish
D.
fish
【单选题】Fish have eyes and ________appears to be a nose, and they can hear, too．
A.
that
B.
which
C.
it
D.
what
【单选题】"A _ fisher named Fisher failed to fish any fish on Friday" is the tongue twister we learnt.
A.
fish
B.
Finnish
C.
Finland
D.
Fisher
【简答题】紫外-可见分光光度法用于含量测定的方法一般有___、___法和标准曲线法。
【简答题】紫外-可见分光光度法仅能测定有色物质的吸光度，无色物质必须经过显色反应后才能进行测定。( )
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