具有涩肠。敛肺，下气，利咽功效的中药是（）

A．赤石脂

B．石榴皮

C．乌梅

D．诃子

E．椿皮

Moving of an anchor over the sea bottom involuntarily because it is no longer preventing the movement of the vessel defines（）.

A.dredging ( of anchor )

B.dragging ( of anchor )

C.weighing anchor

D.walking out anchor