A.0; B.8~10; C.100~200; D.1000~2000
A.1/2倍; B.1倍; C.1/3倍; D.2倍
A.蓄電池放電; B.發(fā)電機有故障而不放電; C.蓄電池充電; D.發(fā)電機無故障