問題詳情
( )79.使用電焊時其電弧長度約等於電焊條直徑幾倍？
(A)
(B)
(C)
(D) 10。
(A)
(B)
(C)
(D) 10。
參考答案
答案：A
難度：簡單0.757576
統計：A(50),B(11),C(1),D(4),E(0)
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