THE_SKIN_FRICTION_DEVELOPED_IN_SAN_FRANCISCO_OAKLAND_BAY_BRIDGE,_WAS_REDUCED_BY,_WHICH_OF_THE_FOLLOWING_METHODS??$

By decreasing the stress developed

BY introducing special equipment

THE_SKIN_FRICTION_DEVELOPED_IN_SAN_FRANCISCO_OAKLAND_BAY_BRIDGE,_WAS_R

1.	THE_SKIN_FRICTION_DEVELOPED_IN_SAN_FRANCISCO_OAKLAND_BAY_BRIDGE,_WAS_REDUCED_BY,_WHICH_OF_THE_FOLLOWING_METHODS??$
A.	BY introducing special equipment
B.	By coating smooth oil surface
C.	By decreasing the stress developed
D.	All of the mentioned
Answer» C. By decreasing the stress developed