A.0.2~0.3s B.0.3~0.5s C.0.4~1s D.0.5~1.5s
A.單側(cè)電源供電的輻射網(wǎng) B.單電源供電環(huán)網(wǎng)及雙電源供電網(wǎng)
A、30° B、0°