葡萄胎清宫术备用物品中不需要 （）

A.大号吸管

B.合血备用

C.雌激素制剂

D.抢救药品及物品

E.缩宫素

The object of plugging holes below the waterline on a ship should be to（）.

A.eliminate all water entering the hole

B.only plug holes in machinery or other vital spaces

C.reduce the entry of water as much as possible

D.plug the largest holes first