With the increase of pressure altitude, .
A: thrust increases, drag increases, thrust minus drag increases
B: thrust decreases, drag decreases, thrust minus drag increases
C: thrust decreases, drag decreases, thrust minus drag decreases
D: thrust decreases, drag decreases, thrust minus drag does not change
A: thrust increases, drag increases, thrust minus drag increases
B: thrust decreases, drag decreases, thrust minus drag increases
C: thrust decreases, drag decreases, thrust minus drag decreases
D: thrust decreases, drag decreases, thrust minus drag does not change
举一反三
- Before the airplane begins to move, thrust must be exerted. It continues to move and gain speed until thrust and drag are equal. In order to maintain a constant airspeed, thrust and drag must remain equal, just as lift and weight must be equal to maintain a constant altitude. If in level flight, the engine power is reduced, the thrust is lessened, and the airplane slows down. As long as the thrust is less than the drag, the airplane continues to decelerate until its airspeed is insufficient to support it in the air. Likewise, if
- 词汇与结构 As long as the thrust continues to be greater than the drag, the airplane continues to _____.
- __ is a force provided by engines to push airplane forward through the air（） A: Lift B: gravity C: thrust D: drag
- The definition of a force is: A: That which causes or tends to cause a change in motion B: Thrust and drag only C: A push D: The result of an applied input
- After annealing treatment, the hardness of steel ____and the plasticity ____ () A: Decreases / increases B: Increases / decreases C: Is reduced / decreases D: Raises/ is improved