A.50m B.100m C.150m D.200m
A.發(fā)電機(jī)調(diào)節(jié)器損壞 B.蓄電池?fù)p壞 C.充電時(shí)間過(guò)長(zhǎng) D.導(dǎo)線與搭鐵短路
A.1V B.2V C.3V D.4V