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Chuyên ngành
Toán & tin
chùm
- pencil of cireles
- chùm vòng tròn
- pencil of curves
- chùm đường cong
- pencil of forms
- chùm các dạng
- pencil of lines
- chùm đường thẳng
- pencil of matrices
- chùm ma trận
- pencil of planes
- chùm mặt phẳng
- pencil of quadric
- chùm quađric
- pencil of rays
- chùm tia
- pencil of spheres
- chùm hình cầu
- axial pencil
- chùm trục
- coaxial pencil
- chùm đồng trục
- cocentric pencils
- chùm đồng tâm
- flat pencil
- chùm dẹt
Kỹ thuật chung
Oxford
(often attrib.) a an instrument for writing ordrawing, usu. consisting of a thin rod of graphite etc. enclosedin a wooden cylinder (a pencil sketch). b a similar instrumentwith a metal or plastic cover and retractable lead. c acosmetic in pencil form.
(usu. foll. by in) a write, esp.tentatively or provisionally (have pencilled in the 29th for ourmeeting). b (esp. as pencilled adj.) fill (an area) with softpencil strokes (pencilled in her eyebrows).
Pencil-case acontainer for pencils etc. pencil-sharpener a device forsharpening a pencil by rotating it against a cutting edge.
Penciller n. [ME f. OF pincel ult. f. L penicillumpaintbrush, dimin. of peniculus brush, dimin. of penis tail]
tác giả
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