1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar, the 1991st year of the Common Era (CE) and Anno Domini (AD) designations, the 991st year of the 2nd millennium, the 91st year of the 20th century, and the 2nd year of the 1990s decade. It was the final year of the Cold War, which had begun in 1947. During the year…
現行的桌球比賽規則並未對「擦邊球」直接下定義,僅規定了比賽台面為桌球台的上表面,其側面不屬於比賽台面,只有將球打到對方比賽檯面上表面才被視為合法擊球。根據上述規則,一旦出現「擦邊球」的情況,裁判員須判定該球是觸及球檯的上表面還是觸及了側面。若球觸及了球檯的上檐邊緣,則為合法擊球,擊球。 See more
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蛇的消化系統包括消化管和消化腺兩部分。 消化管由口到泄殖肛孔止,隨著機體結構形成一根直的長管子,由口腔、食管、胃、f一二指腸、小腸、大腸、泄殖腔、泄殖肛孔等組成。 消化腺包。
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