單項選擇題

A single heavy wire made up for the topping lift is called a（）.

A.Bale
B.Spanner wire
C.Bull line
D.Working guy

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單項選擇題

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

單項選擇題

A “figure eight” knot is used to（）.

A.be a stopper
B.shorten a line
C.join lines of equal size
D.keep a line from passing through a sheave

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