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【判断题】
普通光源不会发生干涉现象，只有简单的亮度加强，不会产生明暗相间的条纹。光源发生干涉现象必须有相干光源，其相干条件是：光的频率相同，振动方向相同，位相相同或相差保持恒定。A.
正确
B.
错误
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举一反三
【简答题】What is the typical dwelling of Shuhe?
【单选题】What is the typical scene found in the campus of Wesleyan University?
A.
Pieces of chalk are scattered everywhere on the ground.
B.
There are some meeting announcements on the billboard.
C.
All kinds of messages are written on the paths.
D.
Some people are shocked by the meeting announcements.
【单选题】What is the typical position of the recipient's address?
A.
the upper left corner of the envelope
B.
the left of the envelope
C.
the upper right corner of the envelope
D.
the middle of the envelope
【单选题】What is the typical malarial paroxysm?
A.
fever, Sweating, chill repeatedly
B.
chill, fever, Sweating repeatedly
C.
Sweating, chill, fever, repeatedly
D.
fever, chill, Sweating repeatedly
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