According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?
A. 80 Mpa
B. 140 Mpa
C. 260 Mpa
D. 510 Mpa
A. 80 Mpa
B. 140 Mpa
C. 260 Mpa
D. 510 Mpa