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Transverse section discrimination shows that the conductor raw materials of different core wires have different colors, and the oxygen-free copper raw materials are uniform gold and copper colors from inside to outside. The cross section of copper-clad steel and copper-clad aluminum raw materials is grayish white, and the outer layer is only a thin copper color. The inner color of the copper-clad copper raw material is pale yellow, and the outer layer is copper.张杨和赵耘交换了一下目光，双双出列，朝上跪下，请皇帝明察，白凡到现在还不肯把一切道出，分明有阴谋。子夜报仇心切，又哪里能看得住？趁人不注意，寻个机会溜了出来，直奔彭城而来。以及和孩子延伸出来的相关事情。四名最搞笑、最爱讲荤素笑料的哥伦比亚喜剧演员为隔离后渴望听他们讲故事的观众奉上精彩的表演。这是？老丁看了看这堆东西，随后一拍脑袋，我知道了。Time relays can be divided into AC relays and DC relays according to different power supply requirements, which are respectively used in AC circuits and DC circuits. Time relays can be divided into power-on delay relays and power-off delay relays according to different functions. Time relays can be divided into sealed relays, small relays and micro relays according to their shapes. In addition to the above classification of time relays, time relays also include special types of relays such as resonant relays, stepping relays, proportional relays, etc.