单项选择题
A stage should only be rigged（）.
A.over the bow or stern of a vessel B.over the flat sides of a vessel C.over the open water D.over the dockside
单项选择题 A snatch block is a（）.
单项选择题 A shepherd’s crook is used to（）.
单项选择题 A sheepshank is used to（）.
