safety detonator 中文意思是什麼
safety detonator
解釋
安全雷管-
Test method of safety of permissible electric - detonator in inflammable gas
煤礦許用電雷管可燃氣安全度試驗方法 -
Test method and judge rules of safety of permissible electric detonator for coal mining in firedamp
煤礦許用電雷管井下可燃氣安全度.試驗方法和判定規則
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