Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.

A.It causes minimal damage

B.It is safe for personnel

C.It is cheaper

D.It is most effective on a per unit basis

下列有关人体水分调节的叙述正确的是（）

A.产生渴觉的中枢位于下丘脑

B.细胞外液渗透压升高，排尿增加

C.抗利尿激素分泌增加，尿量增加

D.细胞外液渗透压降低，排尿增加