在单缝夫琅衍射中,若单缝两边缘点 A 、 B 发出的单色平行光到屏上某点 P 的光程差为 2.5 λ ,则 A 、 B 间可分为 _______ 个半波带, P 点处为第 _________ 级 _________ (填明或暗)条纹。
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【简答题】People often think that having a million dollars would make all their dreams come true. There are TV shows that give contestants the chance to become millionaires. When asked the question 'What w...
【单选题】Dracula persuaded Jonathan Harker that “There are bad dreams for those who sleep unwisely. Be warned!” Which of the following is not its implied meaning?
A.
Dracula is issuing this warning to Jonathan Harker, telling him to stay in his room and not to venture out into the corridors where he would meet those young ladies.
B.
It is an encouragement for Harker to think only of his wife, otherwise there will be dark consequences.
C.
It is also a warning against unfaithfulness in marriage, which is a destructive force in Victorian society.
D.
It displays the fact that all men are easy to fall victim to such sexual temptations.