半衰期合作用维持时间最短的药物是：

A．结晶锌胰岛素

B．低精蛋白胰岛素

C．氯磺丙脲

D．格列吡嗪

E．格列齐特

If your vessel is equipped with inflatable liferafts，how should they be maintained?（）

A.Have your crew check them annually

B.They do not need any maintenance

C.Have them sent ashore to an approved maintenance facility annually

D.Have them serviced by the shipyard annually