【单选题】The mountain I visited last Sunday isn’t very ________. Few ________ go sightseeing there.
【单选题】Suzhou is _____ most beautiful tourist city and I believe I'll come for _____ second time. [ ]
【单选题】在双缝干涉实验中,两条缝的宽度原来是相等的. 若其中一缝的宽度略微变宽,而两缝中心距不变,则( )
D.
干涉条纹的间距不变,但原极小处的强度不再为零
【判断题】在双缝干涉实验中, 两条缝的宽度原来是相等的, 若其中一缝的宽度略变宽, 则干涉条纹间距不变。
【单选题】How long in advance does a tourist have to book?
【单选题】在双缝干涉实验中,两条缝的宽度原来是相等的,若其中一缝的宽度略变窄,则
C.
干涉条纹的间距不变,但原极小处的强度不再为零