皮皮学，免费搜题
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【单选题】
在设计、制造、安装、调整、使用、查找故障和维修、拆卸及处理这些机器产品的寿命周期各环节中，决定机器产品安全性的最关键环节是（）环节。
A.
设计
B.
使用
C.
维修
拍照语音搜题，微信中搜索"皮皮学"使用
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