A.0.1A/10V B.0.2A/20V C.0.3A/30V D.0.4A/40V
A.大于等于0.8V B.小于等于0.8V C.大于等于1V D.小于等于1V
A.大于等于2V B.小于等于2V C.大于等于3V D.小于等于3V