(list-ref (list 'a 'b 'c) 1). 'b. > (list-ref (list 'a 'b 'c) 2). 'c. > (list-ref (cons 1 2) 0) ... (append (list 1 2) (list 3 4) (list 5 6) (list 7 8)).
確定! 回上一頁