单项选择题
A.5S B.8S C.10S D.15S
A.0.38V～9.5V B.0.45V～10.8V C.0.5V～11.2V D.0.65V～12.6V
A.≥7.6V B.≥7.2V C.≤7.6V D.≤7.2V
A.DC187V～DC253V B.AC187V～AC253V C.AC170V～AC246V D.DC170V～DC246V
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