using multiple meta_key and meta_value in query_posts

how can i use multiple meta_key and meta_value in query_posts?

i used this code :

query_posts('category_name=' .$site .'&meta_key=durum&meta_value=aktif&meta_key=yer&meta_value=' .$yer.'&meta_key=tur&meta_value=' .$tur.'&posts_per_page=1');

but it gives only meta_value=aktif where meta_key=durum

meta_key — meta_value
durum — aktif
yer — splash
tur — single