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【简答题】
物体到光心的距离叫做 ;像到光心的距离叫做 。
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举一反三
【简答题】A linguistic (1) is a linguistic item which has identifable (2), which are the different forms which can be used in an environment. For example, words like singing and fshing are sometimes pronounced ...
【简答题】废气再循环(Egr)就是将()中的一部分引入燃烧室中参与燃烧过程。EGR电控系统的功能主要是根据()的运行工况控制EGR率,在大负荷或者()时,发动机不进行废气再循环,而在其他工况下,随进气量的(),EGR量也()
【判断题】Non-standard words usually refer to slangs, jargons, dialects and obsolete words. They sound vivid and colorful, and can be used in all kinds of writings.
A.
正确
B.
错误
【单选题】It can be inferred from the passage that______.
A.
light waves could be used in a device similar to radar
B.
radar was a practical application of a well-known principle
C.
radar gready increased the effectiveness of the Royal Air Force
D.
sound waves are reflected from a hillside under all conditions
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