The military operations()yesterday were targeted at the military installations. A: propelled B: commenced C: plagued D: modulated

The P-I characteristic of LED is linear, so no matter whether it is modulated by analog signal or digital signal, no bias current is required. A: 正确 B: 错误

What is the numerical relationship between the main lobe bandwidth of the frequency band modulated by MSK and GMSK and the bit rate Rb? A: 300 bits/s B: Rb C: 1.5 Rb D: 2 Rb