27.工程製圖中記號“R”所指為何?
(A)圓孔
(B)半徑
(C)圓弧
(D)斜角
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統計: A(7), B(1100), C(47), D(8), E(0) #1969294
統計: A(7), B(1100), C(47), D(8), E(0) #1969294