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滑移-螺旋鉆屬具,真正的打洞高手 |
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點(diǎn)評(píng)
恩,扭矩不小了,所以我才說只是頭部重量不夠,即便換上金剛石鉆頭,也是鉆進(jìn)量受限,稍微鉆深一點(diǎn)就卡住了。不過,這樣的設(shè)備本來也不是鉆深孔的,所以只是這么一說。哈哈
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