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Subject: Thumb penetration test Пожалуйста помогите перевести данную фразу, которая встречается в следующем контексте:The thumb penetration test can be used to estimate the unconfined compressive strength of cohesive soils. (This test is based on the thumb penetration test described in American Society for Testing and Materials (ASTM) Standard designation D2488 - "Standard Recommended Practice for Description of Soils (Visual - Manual Procedure).") The thumb can readily indent type A soils with an unconfined compressive strength of 1.5 tsf; however, the thumb only with very great effort can penetrate them.
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