单项选择题
A.24±5VDC B.220±10VAC C.110+22/-33VDC D.24+6/-7VDC
A.50mm B.70mm C.90mm D.100mm
A.≤20MΩ B.≥20MΩ C.≤500MΩ D.≥500MΩ
A.20s B.15s C.10s D.5s
微信扫一扫,加关注免费搜题
