单项选择题
A.Short splice B.Long splice C.Back splice D.Spindle splice
A small light tackle with blocks of steel or wood that ...
单项选择题A small light tackle with blocks of steel or wood that is used for miscellaneous small jobs is called a（）.
A.snatch block B.threefold purchase C.handy-billy D.chockablock
A single heavy wire made up for the topping lift is cal...
单项选择题A single heavy wire made up for the topping lift is called a（）.
A.Bale B.Spanner wire C.Bull line D.Working guy
A device used to enlarge the size of an existing bore h...
单项选择题A device used to enlarge the size of an existing bore hole，having teeth arranged on its outside circumference to cut the formation as it rotates is a（n）（）.
A.Enlarger bit B.Casing bit C.Hole opener D.Casing opener
