17. The numbers in a table are arranged in 10 rows and 4 columns such that one number is placed at the intersection of each row and column. How many numbers are contained in the table? ' F; }1 l3 C3 G+ h8 e (A) 14 (B) 40 (C) 400 (D) 10 (E) 4 9 }5 {2 J, V* o0 G" }这个题是怎么回事?