49) Number of solutions for the system of linear equations x-2y=8, 2x-4y=15 is

50) Experimentally, the volume fraction of matrix is generally determined by

51) Each strain component is a laminate _____ from the top of the laminate to the bottom of the laminate.

52) What is the minimum number of plies to make a quasi-isotropic laminate?

53) Which composite material retains it's material property at high temperatures?