单项选择题
A.2000-1 B.2000-2 C.2600-1 D.2600-2
A.25Hz B.50Hz C.75Hz D.100Hz
A.45V±2.4V B.48V±2.0V C.48V±2.2V D.48V±2.4V
A.≥25MΩ B.≥50MΩ C.≥100MΩ D.≥500MΩ
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