(A) 20 kgf/cm2
(B) 50 kgf/cm2
(C) 100 kgf/cm2
(D) 150 kgf/cm2
(A) 20 kgf/cm2
(B) 50 kgf/cm2
(C) 100 kgf/cm2
(D) 150 kgf/cm2
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