88 is 1400 kg/cm2 and bond stress is 6 kg/cm2, the If tensile stress of a steel rod of diameter required bond length of the rod is____________________?
A. 30 D
B. 39 D
C. 50 D
D. 59 D
A. 30 D
B. 39 D
C. 50 D
D. 59 D