百度试题 结果1 题目What color is the pencil lead? A. black B. white C. gray 相关知识点: 试题来源: 解析 A。铅笔芯通常是黑色的。白色的铅笔芯很少见,灰色的铅笔芯也不常见。反馈 收藏
B.Carbon.C.Lead.D.Graphite.相关知识点: 试题来源: 解析 D 本题的关键词为graphite,is used to make the“lead”in your pencil.根据关键句可推断出。可能有学生会选[B],因为graphite consists of carbon.但carbon只是一种元素,而不是一种矿物质或金属。
A pencil, whose pencil lead is replaceable and can be moved by rotating a connecting piece, has a helical track provided in a pencil holder. The track is connected to the connecting piece and is in a compressed state. A sliding piece is provided in the track, and the pencil lead is ...
结果1 题目 1.Mechanical pencil lead is actually not made from the chemical element lead. It is made from a mixture of graphite and clay, which (27) not give you lead poisoning. 2021黄浦一模 相关知识点: 试题来源: 解析 can 反馈 收藏 ...
This is a lead-pencil. Let's look at it very carefully. It is made of (由...制成) wood. Do you see the name of the maker (标记) in bright letters on the side of the pencil? You may see the letters H for hard, B for black, or H B for both hard and black. People s...
结果1 题目What color is the lead of a pencil usually? A. Red B. Blue C. Black or gray D. Green 相关知识点: 试题来源: 解析 C。解析:文中提到“The lead is usually black or gray.”,所以铅笔的铅芯通常是黑色或灰色。反馈 收藏
lead还有铅的意思。 1 (symb Pb) 铅 a chemical element. Lead is a heavy soft grey metal, used especially in the past for water pipes or to cover roofs. 2 铅笔芯 the thin black part of a pencil that marks paper The Hershey Co. is being sued for allegedly failing to disclose the pres...
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Karen asks: Why is pencil lead called lead when it doesn’t contain any? In the 16th century, a large deposit of pure, solid graphite was discovered in Borrowdale, England. This was the first time in recorded history that high quality, solid graphite had been found. When metallurgists firs...
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