4246| 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(shuí)來(lái)背
鋁導(dǎo)軌是擠壓出來(lái)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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