对于自然品种或野生原种及其他各种类型的水产养殖群体，多数为群体品种。
参考答案：对
After conducting an abandonment drill，the Master or person in charge of a ship shall log（）.
A.the names of crew members who participated in the drill
B.the length of time that each motor propelled lifeboat was operated in the drill
C.the length of time the lifeboat was in the water
D.the time it took to lower the boat
以下属于货币证券的有（）。
A．商业汇票
B．商业本票
C．银行汇票
D．金融债券
