单项选择题
A natural fiber rope can be ruined by dampness because it may （）.
A.rot B.shrink C.stretch D.unlay
单项选择题 A mooring line leading at nearly right angles to the keel is a （）.
单项选择题 A mooring line leading 45° to the keel，used to check forward or astern movement of a vessel，is called a （）.
单项选择题 A monkey fist is found on a （）.
