spiral ratchet screw driver
... 自动螺纹车床：automatic screw 自动螺丝起子：spiral ratchet screw driver 自动螺丝刀：automatic screwdriver ...
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The problem of grinding large Numbers of small samples of fresh soybean tissues rapidly and without loss was solved by using a grinder modified with a spiral ratchet screw driver.
用自己改制的微量样品研磨器解决了大豆鲜组织的大批量小样品的无损耗快速研磨问题。
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