Suitable for medium hard formation.

适应于中等硬度地层。

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Suitable for soft to medium hard Non-abrasive formation.

适应于软到中硬非研磨性地层。

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Suitable for medium to medium hard formations such as sandstone, limestone and dolomite.

适用于中至中硬地层中使用，如砂岩、石灰岩及白云岩。

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