单项选择题
A serving mallet is used in（）.
A.covering wire or fiber rope B.forcing fids into a line C.dogging hatches D.splicing lines
单项选择题 A rope ladder with wooden rungs is a（）.
单项选择题 A pelican hook（）.
单项选择题 A common class of wire rope is the 6X37 class.What does the 37 represent（）.
