The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively__________________?
(A) zero and zero
(B) 0.5 kg/cm2 and zero
(C) 0.5 kg/cm2 and 0.5 kg/cm2
(D) 1.0 kg/cm2 and 0.5 kg/cm2
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