英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
C14查看　C14　在百度字典中的解释百度英翻中〔查看〕
C14查看　C14　在Google字典中的解释Google英翻中〔查看〕
C14查看　C14　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • ערוץ 14 | C14 - החדשות של ישראל
    ערוץ 14 | c14 - כתבות, דעות, פרשנויות ושידור חי - כל מה שחשוב לדעת על חדשות, ביטחון ואקטואליה - בזמן אמת ובמקום אחד
  • Carbon-14 - Wikipedia
    Carbon-14, C-14, 14 C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam
  • Carbon-14 | Dating, Mass, Half-life | Britannica
    carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts The carbon-14 nucleus has six protons and eight neutrons, for an atomic mass of 14 The isotope also is used as a tracer in following the course of particular carbon atoms through chemical or biological transformations In carbon-14 dating, measurements of the amount
  • What Is a C14 Work Permit and How Do You Qualify for One?
    The C14 Work Permit is designed for individuals with specialized skills or knowledge not readily available in the domestic workforce Applicants must demonstrate their expertise through advanced education, specialized training, or significant work experience
  • Unveiling the C14 Immigration Status: What You Must Know
    The C14 status is a unique classification that pertains to certain individuals residing in the United States Understanding this status is crucial for those who are currently in the U S without a formal visa or are looking to adjust their immigration status
  • Carbon-14 ( 14 C) safety information and specific handling precautions
    Carbon-14 ( 14 C) safety information and specific handling precautions General: Carbon-14 is a low energy beta emitter and even large amounts of this isotope pose little external dose hazard to persons
  • Carbon-14 - isotopic data and properties - ChemLin
    Radioactive Decay Carbon-14 undergoes beta decay with emission of an electron and an electron antineutrino: 14 C → 14 N + e-+ v e + 156 476 keV The decay product is the stable nuclide Nitrogen-14 Half-life T ½ = 5700(30) a respectively 1 79874478055 × 10 11 seconds s
  • How Carbon-14 Dating Works - HowStuffWorks
    For more information on cosmic rays and half-life, as well as the process of radioactive decay, see how nuclear radiation works Carbon-14 in Living Things ­The carbon-14 atoms created by cosmic rays combine with oxygen to form carbon dioxide, which plants absorb naturally and incorporate into plant fibers by photosynthesis (carbon exchange)
  • Carbon-14 - Office of Environmental Health and Safety
    Physical Characteristics Half-life: 5,730 years Emissions: Beta particles with a maximum energy of 156 keV and an average energy of 49 keV Maximum Range: 22 cm in air; 0 027 cm in tissue Fraction transmitted through the dead layer of the skin: 0 11 Dose Rate and Shielding Dose rate to the skin at 10 cm: 600 mrad hour mCi (for an unshielded point s
  • How Does Radiocarbon-14 Dating Work? - EnvironmentalScience. org
    What is Radiocarbon Dating? Radiocarbon dating is a method of what is known as “Absolute Dating” Despite the name, it does not give an absolute date of organic material - but an approximate age, usually within a range of a few years either way The other method is “Relative Dating” which gives an order of events without giving an exact age (1): typically artefact typology or the study





中文字典-英文字典  2005-2009