2022年8月13日
幻方
摘要： 每行、每列、两条对角线的和都是N。 a+b+c + d+e+f + h+i+j = 3N 三行的和 a+e+j + c+e+h = 2N 两条对角线的和 上面两式相减得 b+d + f+i - e = N → b+i + d+f - e = N → N-e + N-e - e = N → 3e = 阅读全文
posted @ 2022-08-13 19:29 华容道专家 阅读(324) 评论(0) 推荐(0)
conference, convention
摘要： A conference is a meeting of people who "confer" about a topic. What is the verb for convention? If a group of people convene, or someone convenes the 阅读全文
posted @ 2022-08-13 17:26 华容道专家 阅读(126) 评论(0) 推荐(0)
Quantum dot display
摘要： Quantum dots (QDs) are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from larger particles du 阅读全文
posted @ 2022-08-13 17:17 华容道专家 阅读(54) 评论(0) 推荐(0)
Semiconductor
摘要： Some of the properties of semiconductor materials were observed throughout the mid 19th and first decades of the 20th century. Developments in quantum 阅读全文
posted @ 2022-08-13 13:47 华容道专家 阅读(313) 评论(0) 推荐(0)
pitch
摘要： "Pitch" is widely used to describe the distance between repeated elements in a structure possessing translational [of or relating to uniform movement 阅读全文
posted @ 2022-08-13 13:43 华容道专家 阅读(204) 评论(0) 推荐(0)
conduct
摘要： conduct. early 15c., "to guide, accompany and show the way," from Latin conductus, 过去分词 of conducere "to lead or bring together; contribute, serve," f 阅读全文
posted @ 2022-08-13 08:49 华容道专家 阅读(231) 评论(0) 推荐(0)