A.40% B.80% C.60% D.70%
A.靜載荷 B.沖擊載荷 C.疲勞載荷 D.拉伸載荷
A.鐵殼開關(guān) B.閘刀開關(guān) C.組合開關(guān) D.倒順開關(guān)