667| 13
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三根導(dǎo)軌的KBK |
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點(diǎn)評(píng)
只能熱軋,不能冷壓,。鋼這個(gè)鍋誰來背
鋁導(dǎo)軌是擠壓出來的,,表面粗糙度小,所以阻力小。鋼軌是熱軋的,,粗糙度大,,阻力大。
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