If the material of the base of the Casagrande liquid limit...

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If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

A. The liquid limit of soil always increases

B. The liquid limit of soil always decreases

C. The liquid limit of soil may increase

D. The liquid limit of soil may decrease

Answer: Option A

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