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請(qǐng)問(wèn)這兩種膨脹螺栓怎么區(qū)分 |
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點(diǎn)評(píng)
第一種也需要預(yù)先打孔吧,,要不然怎么放進(jìn)去,第一種的優(yōu)點(diǎn)就是安裝后外表面高度較低,,
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