A. Two important tests of a new airliner because it is put into use.B. How to carry out tank test in the water.C. How pilots carry out the test flights.D. How to make a safe passenger plane.
A. Two important tests of a new airliner because it is put into use.
B. How to carry out tank test in the water.
C. How pilots carry out the test flights.
D. How to make a safe passenger plane.