Once a computer is put into water, the system _______ and cannot repair itself.

A．breaks down

B．breaks through

C．breaks out

D．breaks up

巨大卵巢肿瘤难以平卧的病人，最适麻醉选择是（）

A.连续硬膜外麻

B.气管内插管全麻

C.脊麻

D.针刺麻醉

E.局麻与强化