問題詳情

5.一般活塞環自由開口 a 與環直徑 D 的關係為？
(A)a = (0.01 ~0.03)D mm
(B)a = (0.05 ~0.08)D mm
(C)a = (0.10 ~0.13)D mm
(D)a = (0.30 ~0.5)D mm

參考答案