國中教甄｜生活科技生活科技113 年第 74 題單選題
Regarding the use of sandpaper, which of the following statements is correct?
AThe smaller the grit number of the sandpaper, the rougher the surface.正確答案
BThe larger the grit number of the sandpaper, the rougher the sanding effect.
CThe grit number of the sandpaper is unrelated to the roughness.
DThe smaller the grit number of the sandpaper, the more suitable it is for the final polishing step.
A正確答案
砂紙號數代表每平方吋的磨料顆粒數，號數越小代表顆粒越大、打磨表面越粗糙。
逐選項解析
AThe smaller the grit number of the sandpaper, the rougher the surface.✓ 正確
砂紙號數（目數）越小，代表單位面積內的磨料顆粒越少且顆粒越大，因此打磨出來的表面越粗糙，適合初步的粗磨作業。
BThe larger the grit number of the sandpaper, the rougher the sanding effect.✕ 錯誤
砂紙號數越大，代表磨料顆粒越小且越密集，打磨效果會越細緻而非粗糙。
CThe grit number of the sandpaper is unrelated to the roughness.✕ 錯誤
DThe smaller the grit number of the sandpaper, the more suitable it is for the final polishing step.✕ 錯誤
立即註冊,看完整詳解
這題的完整詳解,註冊就能看 · 每天 2 題免費
- 完整逐選項解析
- 秒殺解題技巧與破題關鍵
- 關鍵知識表整理
- 陷阱與易錯提醒
- 同考點歷屆題庫連續刷題與錯題本
