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【单选题】
多具有升华性质,升华物遇碱液溶解,并呈红色的成分为A.
黄酮类
B.
蒽醌类
C.
酚类
D.
皂苷
E.
生物碱
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A.
positive
B.
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【单选题】What is the attitude the first speaker holds on the decade he grew up in?
A.
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B.
negative
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A.
Enthusiastic
B.
positive
C.
Grateful
【单选题】根据我国显微镜的现行标准，显微镜的机械筒长和光学筒长分别为：
A.
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B.
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C.
170mm和180mm
D.
160mm和170mm
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