Pencils Pencils have been used to make marks on paper since Roman times, when lead rods were used by people to write with. However, a great discovery of pure graphite was made in farmers'fields at Borrowdale in 1564. The journey to the modern pencil began. The villagers went graphite-crazy...
Although pencils actually are made of graphite and not of lead, the term lead pencil has come to be widely used. A. supposedly B. genuinely C. everywhere D. still 相关知识点: 试题来源: 解析 B 句意:尽管铅笔主要是用石墨制成,而不是铅,但“铅笔”这个词被广泛使用。actually事实上。genuinely...
A. Todaypencilsare not made from lead or graphite. B. The first woodpencilswere made in America. C. German people first used mixed materials to makepencils. D. People first used graphite to make marks on their sheep. 免费查看参考答案及解析 ...
1. Is the pencil lead poisonous? It's not actually toxic, lead is toxic, and graphite and clay are the main materials used to make pencil leads, so they're not toxic. The bases of the pencil lead is graphite and clay, and graphite is flaky solid metal luster, among them with carbon...
LEAD, PENCILS, GRAPHITE, POLYMER (SUPERSEDING A-A-1828A) (NO S/S DOCUMENT)doi:CID A-A-1828B
lead pencil(石墨)铅笔 artist's pencil画笔 ～+名词 pencil box铅笔盒 介词+～ in pencil用铅笔 note in pencil用铅笔写的便条 with a pencil用铅笔书写 词组短语 blue pencil蓝铅笔(用于删改书稿或剧本等的) pencil case文具盒 pencil box铅笔盒 pencil sharpener卷笔刀 ...
No one knows who invented the pencils or when it happened. A Swiss described a pencilin a book in 1565. He said it was a piece of wood with lead (铅)inside it. Pencils weren’t popular. Then, in 1795, someone startedmaking pencils from graphite (石墨),and they became very popular....
结果1 题目 13. Although pencils _ D _ are made of graphite and not of lead, the term “lead pencil" has come to be widely used. A. supposedly B. still C. everywhere D. genuinely 相关知识点: 试题来源: 解析 答案见上 反馈 收藏 ...
He said it was a piece of wood with lead inside it. (Lead is a very heavy, soft, dark gray metal.) Pencils weren't popular, and people continued to write with pens. They used bird feathers as pens.Then, in 1795, someone started making pencils from graphite, and they became very ...
Material::Poplar wood;Shape::Hexagonal Round Triangle;Size::190mm;Pencil Diameter::6.9mm;Lead diameter::2.2mm;Logo::Customized Logo;Packing:12pcs/color Box;OEM:Accept OEM;Usage:Promotion\Business\School\Office Stationery;Sample time:7-10days;Type:Standar