设有以下说明:type t1=file of integer; var f1:t1;n:integer; 且abc.dat是t1型文件,下面正确的程序段是 Aassign(f1,‘abc.dat‘); write(f1,n); rewrite(f1); close(f1);Bassign(f1,‘abc.dat‘); reset(f1); readln(f1,n); close(f1);Cassign(f1,‘abc.dat‘); rewrite(f1); writeln(f1,n); close(f1);Dassign(f1,‘abc,dat‘); rewrite(f1); read(f1,n); close(f1);

设有以下说明:type t1=file of integer; var f1:t1;n:integer; 且abc.dat是t1型文件,下面正确的程序段是

Aassign(f1,‘abc.dat‘); write(f1,n); rewrite(f1); close(f1);

Bassign(f1,‘abc.dat‘); reset(f1); readln(f1,n); close(f1);

Cassign(f1,‘abc.dat‘); rewrite(f1); writeln(f1,n); close(f1);

Dassign(f1,‘abc,dat‘); rewrite(f1); read(f1,n); close(f1);


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