声音刺耳
发表于 2025-3-28 14:57:28
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invade
发表于 2025-3-28 22:14:10
Properties of materials,Before appropriate materials for the manufacture of a given product are chosen, a . of the properties of all . is usually advisable. Among the properties which may need to be considered are mechanical properties, physical properties, and chemical properties.
欢乐中国
发表于 2025-3-29 01:18:58
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淘气
发表于 2025-3-29 04:06:49
The casting of metals,The production of metal objects by the process of casting has been practiced for thousands of years. This is probably the quickest and most economical way of producing a metal component, particularly a large and complex one.
JAUNT
发表于 2025-3-29 09:16:20
The heat treatment of metals,The mechanical properties of metals can be changed to a remarkable extent by subjecting them to heat treatment. Steel is . in its . both as a . which can be easily machined, and after heat treatment as a . out of which . can be made.
反复无常
发表于 2025-3-29 14:04:37
The transmission of power,A working machine is composed of many components, some of which are static and some of which are moving. There are many kinds of motion, of which ., and . are among the most important.
nullify
发表于 2025-3-29 18:34:10
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异端
发表于 2025-3-29 22:20:26
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GET
发表于 2025-3-30 02:51:41
Sheet metal bending and forming processes,The bending and forming of metals are . operations which involve . of the workpiece. The metal has to be stretched beyond the ., but not so far that it . or . Only some metals and alloys have sufficient . to be used in this way. Low carbon steels, killed steels, and alloys of copper and aluminium are widely used for the manufacture of ..
沉思的鱼
发表于 2025-3-30 05:56:38
Drilling, milling, and broaching,A hole in a large mechanical component is usually produced by using a drilling machine. . can be used for many types of operations such as,