下列实验的基本操作中正确的是（　　）

A．用细口瓶盛放固体药品

B．用剩的药品放回原瓶

C．过滤时，倾倒液体用玻璃棒引流

D．向燃着的酒精灯里添加酒精

To improve your vessel’s stabilty in a hazardous situation, you should（）.

A.ballast deep tanks if they are slack

B.transfer ballast athwarships

C.pump out double bottoms

D.fill double bottom from deep tanks