唤醒
发表于 2025-3-30 08:23:02
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垄断
发表于 2025-3-30 13:25:10
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荧光
发表于 2025-3-30 18:52:12
https://doi.org/10.1007/978-94-015-0967-1ccuracy of the work done on a lathe, depends on the skill and experience of the operator. A lot of time is taken for tool setting, tool changing,etc., with the result that it is unsuitable for production work. It is mainly used in tool rooms and workshops for the making of prototypes, and also for maintenance work.
凶兆
发表于 2025-3-30 21:03:04
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变化无常
发表于 2025-3-31 03:39:57
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chemical-peel
发表于 2025-3-31 08:18:35
The joining of metals by soldering and welding,mperature than the metals being soldered. Two types of solder are commonly used One is a soft solder, which is an alloy of tin and lead. The other is a ., which is an alloy of copper and zinc and is often called spelt or silver solder.
笨拙处理
发表于 2025-3-31 10:04:33
The forging of metals,eak easily. Some metal components like crankshafts, connecting rods, spanners, etc, have to stand up to conditions of severe stress when in use. Components produced by the ., are much stronger than those produced by casting or by machining from solid bar material. The reason for this lies in the fac
尊敬
发表于 2025-3-31 17:11:52
The hardening of carbon steel tools,part which is the ., is hardened. The chisel is first heated to a temperature of about 820°C, until it becomes cherry-red in colour. It is then ., by plunging it into cold water or oil. The edge of the chisel will now be very hard, but also very brittle. It is necessary to remove some of this brittl
凹室
发表于 2025-3-31 18:25:28
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zonules
发表于 2025-4-1 00:43:56
Drills and drilling machines,e drilling of a hole of the . at the . can be difficult. A large number of tools and machines have been designed for the drilling of holes economically, accurately, and quickly, in all types of materials.