皮皮学，免费搜题
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【单选题】
电气元件检测中,第一步应当检查()
A.
插接装置松脱
B.
短路故障
C.
电源故障
D.
接地故障
拍照语音搜题，微信中搜索"皮皮学"使用
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B.
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【单选题】Tomorrow is Father's Day. I don't know . [     ]
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