拖拉机发动机转速降低
tractor engine rpm decrease
建议的降低发动机转速
suggested reduced engine rpm
发动机额定转速
engine rated speed
rated engine speed
rated engine revolutions per minute
rated engine rpm
用户特定发动机转速上限
customer specified top engine rpm limit
调速电动机额定转速
base speed of an adjustable-speed motor
降低发动机使用寿命
reduced engine service life
降低发动机效率
reduced engine efficiency