匍匐前进
发表于 2025-3-28 18:02:55
https://doi.org/10.1057/9780230582132Gears (or gear wheels) are . which are usually used to couple two or more rotating shafts. The shafts may be rotating at the . or at ., and can have axes which are pointing in the . or in .. The . of the . of two shafts coupled by gear wheels, depends on the . of the . in the wheels.
Charitable
发表于 2025-3-28 22:30:28
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钩针织物
发表于 2025-3-29 02:48:13
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流出
发表于 2025-3-29 05:34:44
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旋转一周
发表于 2025-3-29 10:57:58
Engineering materials,Manufacturing industry uses a large variety of materials for the manufacture of goods today. Among the most important of these are ., and . Different kinds of metals and alloys are required for different purposes, and the diagram given below shows some of the metals and alloys that are in common use.
责任
发表于 2025-3-29 11:54:23
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.
蜡烛
发表于 2025-3-29 18:59:50
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crumble
发表于 2025-3-29 20:41:25
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alliance
发表于 2025-3-30 03:46:35
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.
钢盔
发表于 2025-3-30 07:23:38
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.