以下选项中（）属于系统阶跃信号时的稳态性能指标。
A.调节时间
B.峰值时间
C.超调量
D.精度
参考答案：D
At the __________ of the gun,the runners dashed from their starting points.
A．sight
B．hearing
C．sound
D．shot
妊娠期肝内胆汁淤积症(intrahepatic cholestasis of pregnancy，ICP)
