单项选择题
A.7s B.8s C.9s D.10s
A.25kPa B.30kPa C.35kPa D.40kPa
A.通电 B.断电 C.短路 D.断路
A.1120~1150 B.1200-1500 C.1400-1600 D.1500-1700
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