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2.a hole, or an empty space between two surfaces
4.the length of a straight line passing through the center of a circle and connecting two points on the circumferenc
7.the degree to which something is strong or powerful
9.a change in the usual shape of something
11.an object used to locate something in machining
12.strong metal that can be shaped easily, consisting of iron and carbon
13.a part of mold for making holes
14.a thin pointed piece of metal that you push and turn in order to fasten something
16.a straight line joining the centre of a circle to its edge
19.work consisting of a piece of metal being machined
1.a chemical substance that exists in a pure form as diamonds
3.a chemical element that is a light, silver-colored metal, used especially for making cooking equipment and aircraft parts
5.the ability of a metal object to absorb considerable energy before cracking
6.empty or clear, or containing no information or mark
7.a tool or liquid chemical used to remove something from a surface
8.the area of mathematics relating to the study of space and the relationships between points, lines, curves, and surfaces
10.bring to a desired consistency or hardness by a process of gradually heating and cooling
15.to become thinner or weaker after continuous use
17.a metal that consists of two or more metals mixed together
18.deformation of a physical body under the action of applied forces

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