单项选择题
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
单项选择题 When liquid is free to move transversely in a tank, the effect is called（）.
单项选择题 When the truck does not work, the driver should（）engines.
单项选择题 When the vessel arrives, the cargo of machinery to be unloaded is（）.
