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【多选题】
关于辐射的描述正确的有A.
自发辐射产生的是相干光子
B.
受激辐射产生的是相干光子
C.
热平衡状态下的物质总的表现为吸收光子
D.
通过黑体辐射源的光子简并度可知黑体总是相干光源
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举一反三
【简答题】Look and write. (根据图片内容，写出单词的首字母)
【判断题】The number of poles of the forward path transfer function at the origin is called the type number.
A.
正确
B.
错误
【简答题】根据首字母或汉语提示写出单词。 1. We should learn how to p _____ a disease rather than learn how to cure a disease. 2. Our class will have a _____ on how to protect our environment next week. 3. I _____ (猜想) it's t...
【简答题】根据句意和所给英文，中文，首字母提示写出单词，完成句子。 1.Can you help Tom with ________(he) homework? 2.My cousin often ________(fly) a kite in spring. 3.The shop is ________(close) at this time of day. 4.My bother buys two __...
【简答题】编程实现:输出100以内7的倍数。
【简答题】根据首字母或所给中文提示,写出正确的单词完成句子. 1. Can you give us a detailed _____(描述) of what you saw in the scene? 2. The prisoners a_____ to escape, but failed 3. M_____ health is as important as physical health. 4. ...
【判断题】The number of poles of the loop transfer function at the origin is called the type number.
A.
正确
B.
错误
【判断题】The number of zeros of the forward path transfer function at the origin is called the type number.
A.
正确
B.
错误
【简答题】We may interpret the absolute as being the number of units a given number is from the origin, regardless of direction.
【简答题】The number of explanations have been offered for its origin, but nobody knows the true story for certain.
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