useful speed造句

Scramjets start working at speeds of at least Mach 4, and have a maximum useful speed of approximately Mach 17.
Structural analysis is often in terms of incompressible dynamic pressure, so that equivalent airspeed is a useful speed for structural testing.
So I don't think it's a practical engineering possibility so spin a planet up to any kind of useful speed.
My ideal of a clever lady rider is one who can ride far, who can ride at a really useful speed, who mounts hills with comfort, and makes no fuss or show of effort.
The design was intended to ensure that battleships could survive against the heaviest armor-piercing shells in use in the early part of the 20th century and be able to carry a powerful armament and retain useful speed and endurance.
It's difficult to find useful speed in a sentence. 用useful speed造句挺难的

I think I don't really care about super-fast wireless modes because for my purposes, wifi is for web surfing and therefore the wifi's useful speed is bounded by the WAN . But the WNR3500L's gigabit ethernet capability would be useful ( the 54GL just has 100Mbit ) and it's a more powerful box in general.