唐代画家韩滉的代表作是（）。

A.《八骏图》

B.《清明上河图》

C.《五牛图》

D.《梅雀图》

A vessel is equipped with cross-connected deep tanks.In which situation should the crossconnection valve be closed?（）.

A.The tank lie above the waterline and are filled

B.The tank are partically filled with dry cargo

C.The tanks are partially filled with liquid cargo

D.The tanks are filled and lie below the waterline