World's Most Accurate Clock
U.S.scientists have built the world's most (A) p___ clock,whose ticking rate varies less than two parts in one quintillion (百万的三次方),or 10 (1) t better than any other,according to National Institute of Standards and Technology physicist Andrew Ludlow.
The clock,made from the element ytterbium (镱),could be used for technological advancements beyond timekeeping,such as navigation systems,(B) m___ fields and temperature."The stability of the ytterbium lattice clocks (镱晶格钟) opens the door to a (2) n___ of exciting practical applications of high-performancetimekeeping." Andrew Ludlow said in a (C) s___.However,some other said,although scientists have proclaimed that this is the world's most stable clock,they do not yet know as much about its (D) a___.
2013-12-05（万方平台首次上网日期，不代表论文的发表时间）
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