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。
acontrary to expectation,scientists tell us that both the diamond and the "lead" from a pencil are composed of the same material-carbon atoms.The primary difference is the arrangement of these atoms. 相反到期望,科学家告诉我们金刚石和“主角”从铅笔由同样材料碳原子组成。第一差别是这些原子的安排...
Other graphite forms such as graphite rods and amorphous nanocarbon, previously used as MALDI matrixes, are more difficult to apply to a stainless-steel target plate than pencil lead. Pencil lead consists of graphite and other component like clay and wax. More information on the subject matter ...
The ‘lead’ in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil slides across the paper more easily. Which statement explains this observation? A. Graphite has a high melting point. B. Graphite is a form of carbon....
单项选择题Questions 22-25 are based on the following passage.What is the "lead" in a pencil made of.’ A.Diamond. B.Carbon. C.Lead. D.Graphite. 点击查看答案&解析 延伸阅读 你可能感兴趣的试题 1.单项选择题The eight airlines of the One-world alliance have joined forces to give world tra...
更多“What is the "lead" in a pencil made of.'?A.Diamond.B.Carbon.C.Lead.D.Graphite.”相关的问题 第1题 What did the man mean by saying "Take it easy unless you want lead for lunch"?()A.Put up What did the man mean by saying "Take it easy unless you want lead for lunch"...
题目I can use this to write on paper. It has a lead inside. What's this? A. pen B. pencil C. crayon 相关知识点: 试题来源: 解析 B。“pen”是钢笔,通常用墨水;“pencil”铅笔里面有铅芯,可以在纸上写字;“crayon”是蜡笔,主要用来画画。所以答案是铅笔。
对于给定的下面的一段计算香农信息熵的python程序，则其输出结果应该为下面的哪个选项？ import numpy as np def calc_ent(x): x_value_list = set([x[i] for i in range(x.shape[0])]) ent = 0.0 for x_value in x_value_list: p = float(x[x == x_value]......
3.1. Preparation of a PLE Electrochemical Immunosensor An electrochemical immunosensor was developed using graphite rods in pencil lead refills bound with a peptide consisting of two epitopes of DTx linked in tandem by two glycines. We previously identified the epitopes selected through a SPOT synthesis...
a pencil with a replaceable and mechanically extendable solid pigment core called a “lead” 参考答案: a propelling pencil或propelling pencil点击查看答案 你可能感兴趣的试题 多项选择题影响污染土壤微生物修复的因素包括() A、微生物菌种 B、污染物性质 C、电子受体 D、环境因子 点击查看答案 单项选择题...