【单选题】In some gastropods, a(n) ( ) is found on the dorsal, posterior margin of the foot and when the foot is drawn into the shell, seals the opening.
【简答题】将序列(p, h, n, d, y, a, f, q, x, m, c, e)中的关键码按字母升序重新排序,初始步长为4的shell排序一趟扫描的结果为(用一个空格分隔字母)Sort the key of sequence (p, h, n, d, y, a, f, q, x, m, c, e) in ascending alphabetical order. The result of a ro...