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【判断题】
液相色谱的流动相配制完成后超声,再进行过滤A.
正确
B.
错误
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【简答题】(2017·全国卷II)Later, engineers ________ (manage) to construct railways in a system of deep tunnels (隧道), which became known as the Tube.
【单选题】可以提高查准率的检索技术有
A.
AND、NOT、截词检索
B.
AND、OR、截词检索
C.
NOT、加权检索、限定检索
D.
精确检索、加权检索、智能检索
E.
加权检索、限定检索、扩展检索
【简答题】Later, engineers ____ (manage) to construct railways in a system of deep tunnels (隧道), which became known to the tube.
【简答题】Later, engineers _______(manage) to construct railways in a system of deep tunnels ( 隧道) , which became known to the Tube. This development was only possible with the introduction of electric-powered ...
【简答题】(2017全国卷2)Later, engineers _________(manage) to construct railways in a system of deep tunnels(隧道), which became known as the Tube.
【简答题】Later, engineers ____________ (manage) to construct railways in a system of deep tunnels, which became known as the Tube.
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