单项选择题
A.512,0.4msB.1024,0.2msC.1024,0.4msD.512,0.2ms
A.2π(2500)rad/sB.2π(1250)rad/sC.2500HzD.750Hz
A.150πrad/sB.0.15πrad/sC.75HzD.0.75Hz