I use a relatively heavy foot and stipple deeply at around 4200 strokes perminute.
我使用的是相对沉重的脚，点画在每分钟约4200中风深刻。
2
The load capacity is 75 LBS per linear foot of conveyor for speeds up to 200 feet perminute.
的承载能力是75英镑每线性脚下的传送带速度高达每分钟200英尺。
3
If your teeth are allowed to drive and leg muscle strength, when the foot uphill as far as possible the number of transferred about 70 perminute (above grade).