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
单项选择题 A single heavy wire made up for the topping lift is called a（）.
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）（）.
单项选择题 A “figure eight” knot is used to（）.
