official speed trial [= official trial]
progressive speed trial
Conversion speed speed -governing
base speed of an adjustable-speed motor
fast-speed (high-speed) railway
HIGH SPEED AND SUPER-HIGH SPEED GRINDING
high-speed cruise speed
low speed region and zero speed
pto vehicle speed limit speed
ratio of travel speed to free flow speed
root-mean-square speed (=root-mean-speed)
speed-rising and speed-falling
Speed-up and Speed-down
Speed-up and Speed-down Control