He was __ with the results of the exam, which can be seen from his __ smile.

A．satisfied, satisfying

B．satisfied, satisfied

C．satisfying, satisfied

D．satisfying, satisfying

船舶受外力作用离开平衡位置，当外力消除后能自行恢复到原平衡位置的性能称为（）

A.船舶稳性

B.船舶浮性

C.船舶摇摆性

D.船舶抗沉性