建议的降低发动机转速
suggested reduced engine rpm
降低发动机额定转速
reduced engine rated speed
降低发动机使用寿命
reduced engine service life
降低发动机效率
reduced engine efficiency
最低发动机机油压力
minimum engine oil pressure
登月舱下降发动机
batch-type Annealing Furnace
拖拉机发动机转速降低
tractor engine rpm decrease