生物的性状指的是生物体的（）。

A．形态特征

B．生理特征

C．结构特征

D．以上三项都是

Each OSV must carry（）.

A.one category I 406 Mhz satellite EPIRB

B.at least one life buoy on each side of the vessel fitted with a buoyant life line

C.at least 12 rocket parachute flares

D.All of the above