单项选择题
A.70%B.75%C.80%D.90%
A.0.1msB.0.2msC.0.25msD.0.5ms
A.平板没提起B.导柱缺少润滑C.气路漏气D.系统没升压
A.8AMPB.10AMPC.15AMPD.20AMP
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