9.3 Air is approaching a converging-diverging nozzle with a low velocity at 20 °C and 85 kPa, and it leaves the nozzle at a supersonic velocity. The velocity of air at the throat of the nozzle is A: 82 m/s B: 98 m/s C: 313 m/s D: 343 m/s

According to quantity equation the price level would change less the proportionately with a rise in the money supply if there were also A: either a rise in output or a rise in velocity. B: either a rise in output or a fall in velocity. C: either a fall in output or a rise in velocity. D: either a fall in output or a fall in velocity.

The direction of the acceleration(加速度), as has been pointed out, is the same as that of the change in velocity.

A body in equilibrium (平衡) must be either at rest (静止) or in motion with constant velocity.

Average velocity is defined by the equation v=s/t,____ v is the average velocity, s is the distance traveled, and t is the elapsed time.

根据IBM的定义，大数据的4V特征是（）。 A: Volume、Velocity、Variety、Veracity B: Valid、Velocity、Variety、Veracity C: Volume、Valid、Variety、Veracity D: Volume、Velocity、Variety、Valid

A body       velocity is not constant is said to be accelerated.

Km is defined as A: Substrate concentration at maximum velocity B: Substrate concentration at half the maximum velocity C: Enzyme concentration D: Optimum temperature

The venturi tube can be used to measure ( ) A: Point velocity B: Point pressure C: Average velocity across section D: Flow rate

Particles whose velocity is _____ critical settling velocity can be totally removed in ideal settling tank. A: more than B: less than C: no demanding