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2024智慧树网课答案 高等数学（下）（东北电力大学版） 最新完整智慧树知到满分章节测试答案
第一章 单元测试
1、问题:
选项：
A:A
B:B
C:C
D:D
答案: 【C】 点我阅读全文
2021 高阶数学分析及其应用(中央财经大学)1464144457 最新满分章节测试答案
2020 商务英语写作实践(中北大学) 最新满分章节测试答案
本答案对应课程为:点我自动跳转查看
本课程起止时间为:2020-10-19到2021-01-23
【作业】第一讲 《商务英语写作》绪论及商务信函结构与格式General introduction and structure and layout of a business letter 第一讲
1、 问题:Arrange the following parts in proper form as they should be set out in a letter.1) Sender’s name: Shanghai Chemicals Trading Co.Ltd.2) Sender’s address: 76 Fuxing Road, Shanghai 200030, China3) Sender’s telephone number: 021-610000004) Sender’s fax number: 021-610000015) Date: May 18, 20106) Receiver’s name: Precise Instruments, Inc.7) Receiver’s address: 202 37th Street, New York, NY 10016, US8) Subject: Hand Tools9) The message:We are interested in hand tools suitable for home decorating and would like to have details of your prices and terms.It would be helpful if you could supply samples.10) Complimentary close: Sincerely yours
评分规则: 【 商务书信格式正确，内容表达准确完整、语言流畅，文字清晰给满分。书信格式错误扣1到3分；内容表达不完整或欠准确扣4到7分；书写及段落不清晰扣1到2分。
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2024智慧树网课答案 C语言程序设计（海南科技职业大学） 最新完整智慧树知到满分章节测试答案
2021 中国传统节日饮食文化赏析与制作(青岛酒店管理职业技术学院)1462780442 最新满分章节测试答案
2021 犯罪学（王志红）(南京森林警察学院)1465413574 最新满分章节测试答案
2021 2021秋医学物理实验（王力海）(山东大学) 最新满分章节测试答案
本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-09-07到2021-12-31
本篇答案更新状态:已完结
【作业】实验五 超声声速的测定 Measurement of ultrasonic velocity 第三次作业
1、 问题:弹吉他时，手指不断的变换位置按住琴弦，并弹奏不同粗细的琴弦来发出不同音调的音乐。请解释并调研吉他的发声机制，并给出相关公式。When playing the guitar, the fingers constantly change their positions, hold down the strings, and play strings of different thicknesses to produce different tones of music. Please explain and investigate the vocal mechanism of guitar and give the relevant formula.
评分规则: 【 一般来说，决定琴弦振动频率的因素有琴弦的粗细形状，琴弦振动部分的长短，琴弦的张力，还有就是琴弦的材质。知道通过手指变换位置来改变弦的长度，进而改变其振动频率，得30分；知道粗细不同的琴弦振动频率不同，因而发出不同的声音，得30分；知道琴弦张力影响频率的，得20分给出琴弦振动类似频率公式得20分Generally speaking, the factors that determine the vibration frequency of a string are the thickness and shape of the string, the length of the vibrating part of the string, the tension of the string, and the material of the string.If you know that the length of the string can be changed by changing the position of the finger, and then the vibration frequency will be changed, 30 points will be obtained;If you know that the strings with different thickness have different vibration frequencies and therefore emit different sounds, 30 points will be obtained;If you know that the string tension affects the frequency, you will get 20 pointsGive the similar frequency formula of string vibration and get 20 points
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