单项选择题 By the sole fact of using the Canal Waters，Masters and Owners of vessels（）themselves to accept all the conditions of the present Rules of Navigation.

单项选择题 At common law the Shipowner has possessory liens on the cargo for（）.

单项选择题 As freight is prima facie payable on delivery of the goods，the burden of making out a case for advance freight（）on the Shipowner.