A.直流+,直流- B.直流-,直流+ C.交流+,交流- D.交流-,交流+
A.5.85V~6.25V B.4.85V~5.25V C.4.85V~6.25V D.4~6V
A.9.0V~16.0V B.10.0V~16.0V C.8.0V~9.0V D.4~6V