Choose the right alternative to complete respectively the blanks in the paragraph.
Since the Theory assumes that there is no soil wall friction, the force (Pa) is ____________ to the backfill surface. On the other hand, since the Theory takes the soil wall friction into consideration, the force (Pa) acts at an angle of from the to the wall. This results in both a vertical and horizontal component of the force (Pa).
Rankine -parallel -Coulomb -perpendicular
Coulomb -parallel -Rankine -perpendicular
Rankine -vertical -Cpoulomb -top
Coulomb -perpendicular -Rankine -parallel
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