BRAVE
发表于 2025-3-23 12:34:58
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不舒服
发表于 2025-3-23 17:38:24
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Albumin
发表于 2025-3-23 20:31:52
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不能约
发表于 2025-3-23 22:24:48
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LOPE
发表于 2025-3-24 06:24:52
Single-phase motors,or motors. The single-phase squirrel-cage induction motor is the most widely used form of machine but suffers from the disadvantage, noted in chapter 1, that it produces no starting torque. In order to produce starting torque, a second stator winding will normally be introduced so that, during the s
receptors
发表于 2025-3-24 10:27:44
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谄媚于人
发表于 2025-3-24 12:29:27
The d.c. machine,ted on salient poles on the stator and the armature winding is wound in slots on a cylindrical rotor. The frequency of the e.m.f. generated in the armature depends directly on the mechanical speed of rotation, and the action of the commutator is that of a frequency changer so that the frequency at t
退潮
发表于 2025-3-24 18:37:30
Semiconductor control of motors,widely used for the control of speed of both d.c. and a.c. motors. In the particular case of the d.c. machine, variation of the magnitude of the voltage applied to the armature and, in some cases, the field of the motor is required. When considering the control of the speed of an a.c. motor, variati
重力
发表于 2025-3-24 19:05:39
A. R. Danielsparticular, the authors pay attention to the material conditions of such practices via the exploration of media discourses on information and communication technologies in the classroom; the ongoing digitization of the school; the use of video chat for language learning; the instantiation of CrossAc
deriver
发表于 2025-3-24 23:40:19
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