To make an rpm-drop test, a tachometer is needed.
做每分钟转速下降试验时，需要一个转速表。
a speed of 100 revolutions per minute
每分钟100转的转速
The drum is rotated at 20 revolutions per minute for 10 minutes.
圆筒以每分钟20转的速度转10分钟。
doing a steady 4000 revs(per minute)
达到（每分钟）4000 转的恒定转速.
A phonograph record designed to be played at45revolutions per minute.
每分钟四十五次转速的唱片
revolutions per minute
(略【物】每分钟转数
This machine cannon has a high rotating speed reaching 500 revolutions a minute.
这架机关炮的转速很高, 每分钟可达到５００转。
The TG70 steam turbine has a operation speed of9600 rotations per minute( RPM).
TG70型蒸汽透平的运转速度为每分钟9600转。
They develop 4.5 horse-power at 9,000 rpm.
当引擎转速为每分钟九千转时，具有4.5马力。
100words per minute shorthand 40 words per minute typing.
速记每分钟100字打字每分钟40字
Max.Spin Speedrpm)
最大脱水转速转/分钟
Max. Spin Speed: 100rpm
最大脱水转速: 100转/分钟
increase the number of rotations per minute.
加快每分钟转动的次数。
a record designed to be played at 45 revolutions per minute
每分钟45转的唱片.
This machine runs at speed of 500 revolutions per minute.
这台机器每分钟500转。
The fastest rotated speed of principal axis motor of optical disc driver has reached about 12000rpm nowadays.
现今光盘驱动器主轴马达的最高转速约为每分钟12000转。
I can type60 words per minute and take short hand at80 words per minute.
我每分钟能打60个字，每分钟能速记80个字。
They tell us that the earth travels over a thousand miles a minute on its way round the sun.
他们告诉我们地球围绕着太阳以每分钟1000米的速度旋转。