单项选择题 A method used to make an eye in a bight of line where it cannot be spliced is known as（）.

单项选择题 A metal ring on the bottom of a block，to which the standing part of a tackle is spliced，is known as a(n)（）.

单项选择题 A metal object on the pier resembling a tree stump and made to receive mooring lines is a（）.