问题
单项选择题
已知电路中零相对电平点上的电平为-5dB,而某点的相对电平为-20dB,该点的相对电平值为()。
A.-35dB
B.-5dB
C.35dB
D.5dB
答案
参考答案:B
已知电路中零相对电平点上的电平为-5dB,而某点的相对电平为-20dB,该点的相对电平值为()。
A.-35dB
B.-5dB
C.35dB
D.5dB
参考答案:B
单句改错 | |
1. Julia have to study for the test. A B C D 2. Can she come to here early? A B C D 3. It takes ten minutes go home. A B C D 4. I don't knows when they're leaving. A B C D 5. I can't join you because I have much too homework to do. A B C D | ( )__________ ( )__________ ( )__________ ( )__________ ( )__________ |