下列各项不属于物流系统优化方法的是（）。

A.规划论方法

B.CAV分析法

C.启发式方法

D.模拟方法

A vessel aground may have negative GM since the（）.

A.decrease in KM is equal to the loss of draft

B.virtual rise of G is directly proportional to the remaining draft

C.lost buoyancy method is used to calculate KM, and KB is reduced

D.displa ement lost acts at the point where the ship is aground