题目内容：
当阀门密封面上的沟槽及擦伤不超过（）时，可用手工研磨。A．0.01mm
B．0.02mm
C．0.04mm
D．0.05mm
参考答案：
单选：当阀门密封面上的沟槽及擦伤不超过（）时，可用手工研磨。
- 题目分类：安全生产法及相关法律知识
- 题目类型：单选
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A．0.01mm
B．0.02mm
C．0.04mm
D．0.05mm
A．0.01mm
B．0.02mm
C．0.04mm
D．0.05mm
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