单项选择题
A.AC4.8V B.AC3.5V C.3.5V D.4.8V
A.AC10V B.AC11V C.AC9V D.10V
A.24V,0.1s B.24V,0.15s C.220V,0.1s D.220V,0.05s
A.30V B.AC35V C.AC30V D.35V
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