Small oil spills on deck can be kept from going overboard by（）.

A.driving wooden plugs into the vents

B.closing the lids on the vents

C.plugging the scuppers

D.plugging the sounding pipes

患者，食后脘腹胀满，朝食暮吐，暮食朝吐，吐出宿谷不化，吐后即觉舒适，神疲乏力，面色少华，舌淡，苔薄，脉象细缓无力。方选

A．小半夏汤
B．大半夏汤
C．苓桂术甘汤
D．附子理中汤
E．丁香透膈散