单项选择题
A.anchor the boat B.pick up heavy loads C.protect fiber rope from abrasion D.strengthen mooring lines
A stopper used in securing the ground tackle for sea th...
单项选择题A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a（）.
A.riding pawl B.buckler C.devil's claw D.locking ring
A stage should only be rigged（）.A.over the bow or stern...
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
A snatch block is a（）.A.block used only with manila rop...
单项选择题A snatch block is a（）.
A.block used only with manila rope B.chock roller C.hinged block D.strong block used for short，sharp pulls
