The U.S. federal funding for research has been unsteady for years.

Look!The bird is flying__________ in the sky. Maybe it was injuried. A: unsteady B: unsteadily C: steady D: steadily

If a flow is unsteady, its ____ may change with time at a given location.（ ）。 A: Density B: All of the above C: Temperature D: Velocity

If a flow is unsteady, its ____ may change with time at a given location. ( ) A: Velocity B: Temperature C: Density D: Pressure E: All of the above

Choose the correct translation of the following sentence: He takes the first unsteady steps on a journey to Portland's streets, the battlefield where he fights alone for his independence and dignity.

N-S equation cannot be applied to ( ) A: Flow of incompressible viscous fluid B: Unsteady flow of incompressible ideal fluid C: Steady flow of incompressible ideal fluid D: Motion of non-Newtonian fluid

In the process of well testing, every measured pressure and production does not change with time is() A: steady-state well testing B: unsteady test C: Pressure well test D: Constant pressure production well test