49. 凹槽形摩擦輪之槽角一般為 (A)30°~40° (B)40°~50° (C)50°~60° (D)60°~70°。

問題詳情

49. 凹槽形摩擦輪之槽角一般為
(A)30°~40°
(B)40°~50°
(C)50°~60°
(D)60°~70°。

參考答案

答案：A
難度：計算中-1
書單：沒有書單，新增

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