• 回复: (无关化学)数理统计的分布表和公式都要记忆么= =?

  • # 16

    回复 16F 等电子的氯 的帖子

    humboldtpenguin Mon, 11 Aug 2008 10:19:01 +0000

    en

  • # 17

    sunnybird Mon, 11 Aug 2008 10:19:15 +0000

    = =

  • # 18

    氢氧化钱 Mon, 11 Aug 2008 10:21:08 +0000

    包括高考在内的大型考试。。。出题人不为自己着想也要为自己家人着想。。。

  • # 19

    CasperVector Mon, 11 Aug 2008 11:04:14 +0000

    Chi (letter)From Wikipedia, the free encyclopedia (Redirected from Χ)
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    Look up Χ, χ in Wiktionary, the free dictionary.

    Greek alphabet
    Αα AlphaΝν Nu
    Ββ BetaΞξ Xi
    Γγ GammaΟο Omicron
    Δδ DeltaΠπ Pi
    Εε EpsilonΡρ Rho
    Ζζ ZetaΣσς Sigma
    Ηη EtaΤτ Tau
    Θθ ThetaΥυ Upsilon
    Ιι IotaΦφ Phi
    Κκ KappaΧχ Chi
    Λλ LambdaΨψ Psi
    Μμ MuΩω Omega
    Obsolete letters
    Digamma Qoppa
    San Sampi
    Greek diacritics
    Chi (uppercase Χ, lowercase χ; Greek: Χι [xiː] He) is the 22nd letter of the Greek alphabet. Its value in Ancient Greek was an aspirated velar stop /kʰ/ (in the Western Greek alphabet: /ks/).
    In Koine Greek and later dialects it became a fricative along with Θ and Φ. In Modern Greek, is has two distinct pronunciations: In front of high or front vowels (e, i, oi, ai, y) it is pronounced as a voiceless palatal fricative [ç], as in German ich or like the 'h' in some pronunciations of the English words 'hew' and 'human'. In front of low or back vowels (a, o, ou) and consonants, it is pronounced as a voiceless uvular fricative [χ].
    In the system of Greek numerals it has a value of 600.
    In ancient times, some dialects of Greek used the chi instead of xi to represent the /ks/ sound. This was borrowed into the early Latin language, which led to the letter X being used for the same sound in Latin, and the modern languages which use the Latin alphabet.
    Chi also was included into Cyrillic alphabet (as letter Х), with the phonetic value /x/ or /h/.
    Chi is the basis for the name Chiastic structure and the name of Chiasmus.
    In Plato's Timaeus, it is explained that the two bands which form the soul of the world cross each other like the letter Χ.
    Chi or X is often used to abbreviate the name Christ, as in the holiday Christmas (Xmas).
    The optic chiasm, an x-shaped connection of the optic nerves leading to the eye, got its name from the letter chi because of its shape; [1] likewise, the shape of the letter chi is the origin of the rhetorical device chiasmus.

  • # 20

    氢氧化钱 Mon, 11 Aug 2008 11:09:40 +0000

    原来我一直把x写成χ(图里面的那个小写)。。。