手触检查部件时，手背触及部件表面的持续时间为（）S时相应的温度为70℃微热上下。A.3 B.7 ...

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问题手触检查部件时，手背触及部件表面的持续时间为（）S时相应的温度为70℃微热上下。

选项 A.3 B.7 C.10

答案 A

解析 P69T317

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