题目内容

I recognized you______ I saw you at the airport.

A. the moment
B. while
C. after
D. once

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He was about to go to bed______ the doorbell rang:

A. while
B. as
C. before
D. when

______I listen to your advice, I get into trouble.

A. Every time
B. When
C. While
D. Until

She had a stomachache ______she ate something bad.

A. so
B. because
C. or
D. although

以下为二进制码,其中功率谱中离散谱分量的码是( )。

A. 等概单极性码
B. 不等概单极码
C. 等概双极性码
D. 不等概双极性码