A.0°~90°B.0°~120°C.0°~150°D.0°~180°
A.90° B.120° C.150° D.180°
A.六個(gè)二極管 B.三個(gè)二極管和三個(gè)晶閘管 C.六個(gè)晶閘管 D.六個(gè)三極管