单项选择题
A.0mm B.1±0.5mm C.2±0.5mm D.3±0.5mm
A.20km/h B.30km/h C.40km/h D.50km/h
A.95° B.100° C.105° D.110°
A.0.7V B.0.5V C.0.1V D.24V
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