题目内容

Whose telephone number is 332-6938?

A. John
B. Paul
Cindy

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Is Paul single or married?

A. single
B. married
C. not mentioned

以下不是websocket方法的是 ( )

A. open()
B. message()
C. error()
D. complete()

郎伯-比尔定律

简述郎伯-比尔定律的物理意义

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