单项选择题
A.1.2V B.1.4V C.1.6V D.1.8V
A.3.0A~4.0A B.3.5A~4.5A C.4.5A~5.5A D.5.5A~6.5A
A.800m B.900m C.1000m D.1100m
A.断开 B.串联 C.短路 D.并联
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