单项选择题
Lines or gear NOT in use should be（）.
A.conspicuously marked B.stowed anywhere C.left on deck D.secured or stowed out of the way
单项选择题 Laying out a line in successive circles flat on deck with the bitter end in the center is known as（）.
单项选择题 In plugging submerged holes on a vessel，rags，wedges，and other materials should be used in conjunction with plugs to（）.
单项选择题 By definition，a spar deck is the（）.
