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
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
举一反三
- __ is a force provided by engines to push airplane forward through the air（） A: Lift B: gravity C: thrust D: drag
- 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
- The radial thrust force Fp , which consumes no power, is the main reason that causes the machine tool vibration and affects the machining accuracy.
- The radial thrust force Fp , which consumes no power, is the main reason that causes the machine tool vibration and affects the machining accuracy. A: 正确 B: 错误
- There is a _________ of scientific research from the pure to the applied field. A: change B: shift C: motion D: variation