题目内容

列出常用有源设备、无源器件,并说明作用。

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简述可综合室内分布的系统。

What is the passenger doing now?

A. He is checking in at the airport.
B. He is going through the security check.
C. He is booking a flight ticket.

Where is the passenger flying ?

A. Berlin.
Bangkok.
C. Moscow.

What is the passenger's flight number?

A. SQ 821.
B. SU 574.
CA 1849.

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