2. 有關銑床加工中之下銑法(Down milling)，又稱為順銑法，下列 敘述何者正確？
(A)切屑形成係由厚至薄
(B)切削力係由小至 大
(C)刀刃磨耗較上銑法嚴重
(D)易生振動且不易排屑

48. The word "attenuating" as it is used in paragraph 4 most nearly means ＿＿＿. (A) augmenting (B) warranting (C) wrenching (D) weakening (E) ascertaining

49. According to the passage, which of the following is NOT true? (A) People with limited English proficiency may have more difficulty accessing health information about important health care services and related disease symptoms. (B) Language barriers in access to care include issues such as communication difficulties due to discordant languages between patients and health care providers. (C) Professional medical interpreter services can reduce language barriers, be expensive and inconvenient in community-based clinics. (D) English-speaking patients may not actually have an adequate level of English health literacy, thus limiting the possibility of dialogue with health care providers. (E) Professional interpreter services are underutilized in primary care settings, even when required by law, but private practices use professional interpreters in acute care settings.

50. Which of the following would be the most appropriate title for this passage? (A) Medical Communication in the United States, Australia, and Taiwan (B) Impact of English Proficiency on Access to Health Care Services (C) Language Barriers of Hispanics, Non-Hispanic Whites, and Asians (D) Communication Reliance and Forgone Medical Care (E) Public Health Care Services and Professional Interpreter Services

1. 有關砂輪構造的敘述，下列何者正確？ (A)砂輪磨料硬度高稱為 「硬砂輪」 (B)結合度弱之砂輪適用於硬質材料之磨削 (C)疏 (鬆)組織砂輪適用於精磨作業 (D)砂輪磨粒號數愈小，其粒度愈 細

3. 有關鉸孔之敘述，下列何者正確？ (A)一般而言，鉸孔可改善鑽 削過之孔精度與表面粗糙度 (B)一般的鉸孔工作，仍以鎢鋼材質 之鉸刀為主 (C)鉸削裕留量，一般為固定值，和鉸孔直徑無關 (D)機械鉸削速度，一般多高於鑽削速度

4. 線切割放電加工機(WEDM)，適用於模具之製作加工，其線電極材 料通常採用？ (A)黃銅、純銅或鎢 (B)石墨或碳化矽 (C)鐵或鋁 (D)石墨或碳 化鎢

5. 有關金屬切削的敘述，下列何者不正確？ (A)工件的硬度及延展 性愈高，切削性愈差 (B)切削速度對刀具壽命的影響非常大 (C) 切屑之捲曲半徑愈大，斷屑效果愈好 (D)刀具斜角較大，較易形 成連續切屑

6. 有關機械材料與加工性的敘述，下列何者不正確？ (A)純銅的切 削性比黃銅差 (B)碳鋼的鑄造性比鑄鐵差 (C)鋁合金的鍛造性 比純鋁佳 (D)鑄鐵的銲接性比碳鋼差

7.欲切削不鏽鋼，該選用下列何種刀具？ (A)高速鋼 (B)P 類碳化物 (C)M 類碳化物 (D)鑽石

8. 有一工件長度 160mm ，若以車床採尾座偏置法，車削大徑 30mm， 小徑 25mm，長 100mm 之錐度時，應將尾座偏置多少 mm？ (A)3.5 (B)4.0 (C)4.5 (D)5.0