Root canal preparation with hand use stainless steel file.

手用不锈钢锉根管预备。

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Theproducts include:screen family, chair family, log family, plate type family, sofa and teapot family, steel file cabinet family and so on.

生产产品包括：屏风系列、座椅系列、原木系列、板式系列、沙发茶几系列、钢制文件柜系列等。

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Objective: To compare the clinical effects after root canal preparation with hand use stainless steel file, nickel titanium alloy engine file and root canal ultrasonic file.

目的：比较手用不锈钢锉，镍钛合金机用锉和超声根管锉在根管预备后的临床效果。

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And the problem is not confined to the UK. During the past two years, 11 steel firms in the United States had to seek protection from their creditors and file for bankruptcy.

BBC: Q&A: Why did Corus cut jobs?