百度试题 结果1 题目What effects the amount of carbon-14 on earth() A. The life cycle of trees B. The number of trees C. The intensity of solar burning D. The quality of air 相关知识点: 试题来源: 解析 C 反馈 收藏
The Chinese government is publishing this white paper to present the achievements of the BRI during the past 10 years. It will give the international community a better understanding of the value of the initiative, facilitate high-quality cooperation under it, and ultimately deliver benefits to more...
百度试题 结果1 题目What is the atomic number of carbon? A. 6 B. 8 C. 12 D. 14 相关知识点: 试题来源: 解析 A。解析:碳的原子序数是6。选项B,8是氧的原子序数。选项C,12是碳的相对原子质量。选项D,14是硅的原子序数。反馈 收藏
Carbon-14 is considered a "cosmogenic nuclide," meaning it forms when cosmic rays impact atoms, forcing nucleons (protons or neutrons) from them. Carbon-14 is created in the atmosphere out of nitrogen atoms. Answer and Explanation:1
23. What is the main purpose of the passage? A. To introduce a unique instrument. B. To persuade us to buy our own Kazoo. C. To explain the Kazoo’s cultural value. D. To stress the importance of using Kazoo...
G.Thisway,you?rerecordingtheimportanceoftheteacher?ssayingandnotjustrawfacts. 1. 2. 3. 4. 5. 高中英语 选择性必修 第二册 第21页 21 分钟能力强化组合练(六) 一、阅读理解 阅读下列短文,从每题所给的 A、B、C、D四个选项中选出最佳选项。 A 语篇类型:说明文 主题语境:人与社会 词数:256 难度...
D.Tostresstheimportanceofself-regulatingsystem. 13.Whatisthesecondparagraphmainlyabout? A.TheunexpectedbenefitofCOVID-19. B.TheeconomicinfluenceofCOVID-19. C.ThepreventivemeasuresforCOVID-19. D.ThepossiblecausesofCOVID-19. 14.Whatdoestheunderlined word “repress”inthe lastparagraphreferto? A.Control...
Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that originated from living organisms. An age could be estimated by measuring the amount of carbon-14 present in the sample and comparing this against an inte
③This is a merchant ship of 5,000 tons.(adj.海上货运的) 2.negotiate vt.商定;达成(协议) vi.谈判;磋商;协商 ①We've decided to negotiate a loan with them.(vt.商定) ②He negotiated a new contract with the sellers.(...
What is the importance of buses on computers? Buses play an essential role inmodern computersby connecting all computer parts together with an efficient communication method. As discussed above, they enable the subsystems -such asI/O ports,RAMandROM-to interact with one another by providing fast ...