Shown in the figure the longitudinal direction of a rectangular combined footing. The columns of 40x40 cm are subjected to the below ultimate loads: Column 1: Qu1 = 2383 KN Column 2: Qu2 = 1.2 x Qu1 KN Given that: qall, net = 230 KPa , f'c = 21 Mpa , fy = 400 MPa ; load factor =1.5

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces.a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.