問題詳情
39. 兩內接圓柱摩擦輪，已知大輪直徑為小輪直徑的4倍，而兩輪軸心相距180 mm，則大輪直徑為多少mm？
(A)60
(B)120
(C)240
(D) 480
(A)60
(B)120
(C)240
(D) 480
參考答案
無參考答案
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