O verbo principal é “gravou” e está no pretérito.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

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.