中圈开球时，将球直接踢进对方球门如何处理（）。

A.进球无效

B.进球有效

C.重罚中圈球

When cargo is shifted from the main deck into the lower hold of a vessel,（）.

A.The metacenter will move downward

B.The GM will increase

C.The center of buoyancy will move upward

D.The list of the vesel will become great