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【单选题】
在单缝夫琅衍射实验中,平行单色光垂直入射到单缝上。对应于衍射角为30°的,若单缝处波面可分成 3个半波带,则缝宽度等于波长的A.
1倍
B.
2倍
C.
3倍
D.
4倍
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【简答题】One day, a train was approaching the small town of Cheekyville. On the train was a 1 man with a big suitcase. He was called William Warbler and he looked very 2 indeed. But what made him most unusual ...
【判断题】第四方物流是比第三方物流更进一步的物流服务业态，它是从整个供应链的角度出发，为整个供应链提供物流解决方案。所以应该多发展第四方物流，不要发展第三方物流。
A.
正确
B.
错误
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【简答题】阅读理解。 It was Sunday. The train was crowded. A gentleman was trying to look for a place. In one of the cars he saw a vacant seat . But a small suitcase was lying on it and a young man was sitting next ...
【简答题】人体工程学的研究方法主要有( )、( )、( )、( )、( )等。
【简答题】It was Sunday .The train was crowded. A gentleman was trying to look for a place. In one of the cars he saw a vacant seat. But a small suitcase was lying on it and a young man was sitting next to it ....
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